Problem Agrarian Skies - Too many server crashes

[Alphasoldier]

Oh boy, where do I start.
A few friends and myself are playing on a small server I'm hosting. After somehow impossibly having screwed up the server installation, it wouldn't work. After some work, reinstalling Java(64), the ASHQ server and FTB, I got it to work.

So we played and played, and crashed a few times randomly, we didn't pay much attention. But then we started noticing that the server crashes when we do specific things. First off, it crashed when putting down Better Barrels, this was apparently not that frequent, and they worked sometimes. Then, as we progressed, we had to make a Tank from OpenBlocks. This too crashed the server when it was placed down. Deciding not to use that, we went on with other endeavors, and made a Void Hopper. Again, this crashed the server when placed.

Now after testing the void hopper out in SP, it worked. I also tested out the same kind of build, then tried the server map in SP, and that worked too. Then remade the world we were in, this time from the ASHQ default MP map you can download. We blasted everything to bits and rebuild everything in creative. Shortly after I tried to use the hopper again. First it crashed the server, then I ported the map into SP (again), placed it down, and moved back to the server. I continued with it and was able to place the hopper down and then also move it.

And then we tried to plant Lettuce Seeds from HarvestCraft, and the server crashed again, and consistently crashes after trying again.
I'm honestly kind of tired from all the crashes, and while I am really enjoying this mod, these crashes make me want to scream and tear my hair out.

So in short:
Things that have made the server crash:
Better Barrel
Void Hopper
Tank (OpenBlocks)
Lettuce Seeds (HarvestCraft)

Can someone please help me, or even point me in the right direction?

Here are the logs, but it doesn't show anything specific. Is there a way to force more information out of the server when it's crashing?

2014-07-04 15:22:30 [FINE] [NEIPlugins] FirstTickHandler - server side finish
2014-07-04 15:22:36 [INFO] [STDOUT] [MobiusCore] Found net.minecraft.network.TcpConnection [ co ] with checksum BD7680D8AB58386CFD42EE8B05FD8430
2014-07-04 15:22:36 [INFO] [STDOUT] Found TcpConnection. Starting injection
2014-07-04 15:22:36 [INFO] [STDOUT] [MobiusCore] Successful injection in i ()Z
2014-07-04 15:22:36 [INFO] [STDOUT] [MobiusCore] Successful injection in a (Z)Ley;
2014-07-04 15:22:37 [FINEST] [ForgeModLoader] Received valid FML login packet from /127.0.0.1:49267
2014-07-04 15:22:38 [INFO] [ForgeModLoader] User Alphasoldier connecting with mods [MineFactoryReloaded|CompatForgeMicroblock, ExtraUtilities, simplyjetpacks, CoFHMasquerade, pamharvestcraft, BiblioCraft, jadedspawn, Aroma1997CoreHelper, MineFactoryReloaded|CompatRailcraft, autopackager, MineFactoryReloaded|CompatMystcraft, MagicBees, HungerOverhaul, extracells, MineFactoryReloaded|CompatRP2, NEIAddons|MiscPeripherals, ObsidiPlates, TMechworks, Mariculture, Thaumcraft, Forestry, TConstruct, CoFHWorld, BinnieCore, TSteelworks, MineFactoryReloaded|CompatAtum, IronChest, MineFactoryReloaded|CompatThermalExpansion, Natura, HardcoreQuesting, NEIAddons, ChickenChunks, islandbuilder, Waila, CoFHCore, MineFactoryReloaded|CompatAppliedEnergistics, MineFactoryReloaded|CompatXyCraft, AppliedEnergistics, CoFHLoot, MineFactoryReloaded, MFR Compat Extra Trees, ThermalExpansion, OpenBlocks, MineFactoryReloaded|CompatBackTools, MineFactoryReloaded|CompatProjRed, gendustry, MineFactoryReloaded|CompatForestryPre, inventorytweaks, NetherOres, crowley.skyblock, MineFactoryReloaded|CompatIC2, AWWayofTime, MineFactoryReloaded|CompatVanilla, Enchiridion, MineFactoryReloaded|CompatThaumcraft, warpbook, MineTweaker, InfernalMobs, JABBA, MineFactoryReloaded|CompatPams, PluginsforForestry, ForgeMultipart, MineFactoryReloaded|CompatExtraBiomes, ExtraBees, Redstone Arsenal, OpenMods, MineFactoryReloaded|CompatChococraft, flatsigns, MineFactoryReloaded|CompatTwilightForest, MFR Compat Forestry Trees, Forge, exaliquo, BigReactors, IguanaTweaksTConstruct, MineFactoryReloaded|CompatBuildCraft, MineFactoryReloaded|CompatForestry, MineFactoryReloaded|CompatSufficientBiomes, ExtraTrees, McMultipart, DenEvents, CoFHSocial]
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerPlayer
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerRepair
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerWorkbench
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerHopper
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerChest
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerFurnace
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerMerchant
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerBrewingStand
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerBeacon
2014-07-04 15:22:38 [INFO] [ForgeModLoader] InvTweaks: net.minecraft.inventory.ContainerDispenser
2014-07-04 15:22:38 [INFO] [Minecraft-Server] Alphasoldier[/127.0.0.1:49267] logged in with entity id 0 at (-1303.0035854068028, 146.0, 1481.2594697496768)
2014-07-04 15:22:38 [INFO] [Minecraft-Server] Alphasoldier joined the game
2014-07-04 15:22:38 [INFO] [STDOUT] Empty or invalid rednet blacklist entry found. Not adding to rednet blacklist.
2014-07-04 15:22:38 [INFO] [STDOUT] [MobiusCore] Found net.minecraft.network.MemoryConnection [ cn ] with checksum E7EF057BBD1B1B253FF680E09C761281
2014-07-04 15:22:38 [INFO] [STDOUT] [MobiusCore] Successful injection in b ()V
2014-07-04 15:22:38 [INFO] [STDOUT] [MobiusCore] Successful injection in a (Ley;)V
2014-07-04 15:22:38 [INFO] [STDOUT] Loading Player: Alphasoldier
2014-07-04 15:22:38 [INFO] [STDOUT] Sending serverside check to: Alphasoldier
2014-07-04 15:22:43 [INFO] [ForgeModLoader] InvTweaks: cpw.mods.ironchest.ContainerIronChestBase
2014-07-04 15:28:44 [SEVERE] [Minecraft-Server] Reached end of stream for /69.180.65.205
2014-07-04 15:28:46 [FINEST] [ForgeModLoader] Received valid FML login packet from /69.180.65.205:56053
2014-07-04 15:28:47 [INFO] [ForgeModLoader] User TheHolyInvader connecting with mods [MineFactoryReloaded|CompatForgeMicroblock, ExtraUtilities, simplyjetpacks, CoFHMasquerade, pamharvestcraft, BiblioCraft, jadedspawn, Aroma1997CoreHelper, MineFactoryReloaded|CompatRailcraft, autopackager, MineFactoryReloaded|CompatMystcraft, MagicBees, HungerOverhaul, extracells, MineFactoryReloaded|CompatRP2, NEIAddons|MiscPeripherals, ObsidiPlates, TMechworks, Mariculture, Thaumcraft, Forestry, TConstruct, CoFHWorld, BinnieCore, TSteelworks, MineFactoryReloaded|CompatAtum, IronChest, MineFactoryReloaded|CompatThermalExpansion, Natura, HardcoreQuesting, NEIAddons, ChickenChunks, islandbuilder, Waila, CoFHCore, MineFactoryReloaded|CompatAppliedEnergistics, MineFactoryReloaded|CompatXyCraft, AppliedEnergistics, CoFHLoot, MineFactoryReloaded, MFR Compat Extra Trees, ThermalExpansion, OpenBlocks, MineFactoryReloaded|CompatBackTools, MineFactoryReloaded|CompatProjRed, gendustry, MineFactoryReloaded|CompatForestryPre, inventorytweaks, NetherOres, crowley.skyblock, MineFactoryReloaded|CompatIC2, AWWayofTime, MineFactoryReloaded|CompatVanilla, Enchiridion, MineFactoryReloaded|CompatThaumcraft, warpbook, MineTweaker, InfernalMobs, JABBA, MineFactoryReloaded|CompatPams, PluginsforForestry, ForgeMultipart, MineFactoryReloaded|CompatExtraBiomes, ExtraBees, Redstone Arsenal, OpenMods, MineFactoryReloaded|CompatChococraft, flatsigns, MineFactoryReloaded|CompatTwilightForest, MFR Compat Forestry Trees, Forge, exaliquo, BigReactors, IguanaTweaksTConstruct, MineFactoryReloaded|CompatBuildCraft, MineFactoryReloaded|CompatForestry, MineFactoryReloaded|CompatSufficientBiomes, ExtraTrees, McMultipart, DenEvents, CoFHSocial]
2014-07-04 15:28:47 [INFO] [Minecraft-Server] TheHolyInvader[/69.180.65.205:56053] logged in with entity id 2130 at (-1292.2991025668405, 146.0, 1471.0400989910186)
2014-07-04 15:28:47 [INFO] [Minecraft-Server] TheHolyInvader joined the game
2014-07-04 15:28:47 [INFO] [STDOUT] Loading Player: TheHolyInvader
2014-07-04 15:28:47 [INFO] [STDOUT] Sending serverside check to: TheHolyInvader
2014-07-04 15:28:47 [WARNING] [Minecraft-Server] Fetching addPacket for removed entity
2014-07-04 15:28:47 [WARNING] [Minecraft-Server] Fetching addPacket for removed entity
2014-07-04 15:28:47 [WARNING] [Minecraft-Server] Fetching addPacket for removed entity
2014-07-04 15:28:47 [WARNING] [Minecraft-Server] Fetching addPacket for removed entity
2014-07-04 15:28:47 [WARNING] [Minecraft-Server] Fetching addPacket for removed entity
2014-07-04 15:29:08 [INFO] [Minecraft-Server] <TheHolyInvader> Wanmt me to put the lettuce down?
2014-07-04 15:29:15 [INFO] [Minecraft-Server] <Alphasoldier> Save all first, sec
2014-07-04 15:29:19 [INFO] [Minecraft-Server] Unknown command. Try /help for a list of commands
2014-07-04 15:29:21 [INFO] [Minecraft-Server] Saving...
2014-07-04 15:29:22 [INFO] [Minecraft-Server] Saved the world
2014-07-04 15:29:24 [INFO] [Minecraft-Server] <Alphasoldier> k

I'd love to paste more logs, but it's 1,5mb so far.

 

[UnionCraft]

Unfortunately its a very crashy modpack in general, the only thing you can do it start banning items causing the crashes.

Better Barrels are hit and miss, most of the time they do behave tho
Vacuum hopper only crashes when its placed next to a vanilla hopper, we banned vanilla hoppers.
Open Block tanks have a ton of issues including a memory leak which will top out your servers ram, we banned those but there are many alternatives so its not a big issue.
Never had an issue with Lettuce Seeds

You server log isn't showing anything, check the crash-reports folder for logs in there.

 

[Alphasoldier]

There's a crash report folder in the main FTB dir, but I don't see any in the server one. Is there some way to turn that on, or am I forced to recreate the crashes in SP?

Also, thank you very much for the reply, didn't think I'd still get one.