your mistweaver isnt using uplift.... at all.
I havent had a 10M group, so maybe the group size is too small for uplift to be effective, but that is something to atleast try out. Its the bread and butter of the spec, at this point he is basically a green, less effective paladin.
Ill link a log of my kill as a mistweaver. I normally do around 37k hps, but I actually had to DPS the boss because the enrage timer was so tight, my hps is lower for the trade off of 4k passive dps. It actually made the difference on the fight because we only had a few people standing after he enraged. Squeeze out dps from everyone, every source.
http://www.worldoflogs.com/reports/r...8&e=1754#Veeps
Also in the final minute, you can gain an extra 30 seconds after the butcher enrages. Coordinate with your hunters to taunt + feign death from across the room. Have all your range spread out so he needs to walk over a greater distance to kill, etc. You can get away with 18k dps, instead of 20k dps
Edit: This was in a pug raid btw, the fight is doable.