Okay #4 boss is actually pretty easy.... just got to strafe back and forth a bit further, like halfway across the room and back, then just circle around him on you tank.

I'm beginning to wonder how much easier these instances would be with dot/hot strong classes. Like Druid Healer and 3 warlocks with pets. (I'm running Prot Pally, 2 Enh Shammies, 1 Arc Mage, and a Disc Priest).