Arcane Explosion at level 55 really helped. Two arcane explosions take care of most of the groups. My pally got a few consecrate ticks in first just to give the mage a little breathing room.

I didn't even need Hellfire or Holy Nova this time around. Made it a bit easier. Biggest problem is getting a patrol and then aggro from respawns while you are killing the patrol.

I had problems at level 54, my aggro range was just a little too big I think. I get too much aggro and eventually run out of mana and nowhere to mana up.

Challenging room though, good fun, and then you still need to deal with the bloody elite fire elementals.