been running 3 warlock affliction specced and a shammy to heal on occasion there only level 24
I send in the voids before they even get to the target cast coa and corruption target something else send in voids cast ...
lifetap then when the get low heal em up and keep going.

I'm pretty sure just about anything yer level will drop in a hurry with just coa/curruption
unless its an elite or really high red its not gonna survive long enough for yeh to cast all them spells :p