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Please post your log using pastebin or feed the beast paste. I don't download files from random people on the internet.
You did say it has frozen when joining the server. Could it be lag from that? Try out single player to see if the issue happens there.
The pack has rftools, I believe, and if it was not removed you can create a dragon world so that enderdragons will spawn. If you have killed the ender dragon already then use the draconic evolution resurrection ritual to spawn it again.
If looks like you are either running a 32bit os or using 32bit java. If you have a 32bit os then you won't be able to play any new, 1.6.4 and above, modpacks. If you have 32bit java then you need to remove it and install the 64bit version and then allocate 2gb or more memory to java.
Sorry don't know. Check with the mod makers to see if there is an issue with those versions. Is there a more up to date version. I assume you have a backup of your world before you updated if not then you should have.
Edit: I have just checked and in the changelogs the dw20 pack mentions some...
The pack is not meant to be hard anyway. The pack creator, Bacon Donut, has stated this before. You can also obtain armor from mob drops and loot bags as well.
Unfortunately it is a feature from the sag mill to get potentially more back. I myself don't see the point in doing this if you are at a point that you have either magical crops, a quarry or rf tools worlds for getting resources.
Firstly use pastebin or ftb paste for your logs not a wall of text. If you actually read your log it says to not report the crash because you have modified the pack.