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This might work, you need to set up a server to run Sponge, but this plugin should allow you set per world inventories, https://ore.spongepowered.org/TrenTech/ProjectInventories
FTB Utilities should have an option to set home. You might need to edit the config to allow setting them. Also depending on what minimap the pack has, you might be able to teleport to a waypoint, you may need to eanble cheats to do so.
There should be a crash report in the packs folder and it should tell whats wrong. First thing I recomment is to remove Optifine, it's not supported and may cause issues. Another thing to check is that you have installed the correct version of Forge. Also make sure you have installed any library...
You can still download the old FTB Launcher, under the red Download Now button click one of the links to the legacy launcher. https://www.feed-the-beast.com/ Also post the log