Novus.. try a frost resistance aura on your pally if you have one. magma's for trash on the team.

CoS, I do everything in CoS from the room where you can get repairs prior to the whole thing starting and have my pally avenging shield mobs and running back to the room.
litterally nothing is a problem from inside of the room, magma's + pally concecrate kill everything.

Drak Thraron.
my biggest problem there is keeping up avenging shield. I have a macro with several attacks + shield and once in a while the shield is down ( not good ).