1. Your Java is 6 updates behind, and you should update
2. This file path [Line 5 [15:33:16] [INFO] LaunchFrame.main:148: Java home: E:\java] is incomplete, there should be more to it. Unless you removed information that contained your name, or something.
3. Try reducing the amount of memory you have allocated. 4.5 GB is pretty hefty, and Java is really bad at properly allocating RAM. Try 3.5 or 4, I find those amounts to work the best.
4. Why do you have all of your FTB & Java on your E drive (not really all too important at the moment, just rather interesting)
5. Regarding the Mystcraft problem at hand: you can (a) delete that age from your DW20 folder, though it may not properly delete with your player in it (b) delete your player.dat file from your DW20 folder, the delete the age-you'll lose your items and end up at spawn, but you'll be out of the age, and the age should be able to properly delete with your player removed from it