I was running a DK, Mage, Mage, Priest setup and their AOE was pretty easy. The DK dropped D&D for aggro control and the other guys just spammed their Insta AoEs. I usually just dragged my whole crew behind my DK letting him get the aggro. Since the Shamans are not as fluid with AoE I will probably park them and drop magma totems and spam Chain Lightning on mobs the DK pulls back to them.

Or just have the DK use his AOE while he soaks up the totem farm love and just have them single target DPS mobs. Either way probably works just fine.