It might just be me, but it kinda feels like the idea of a gavriel bomb is bad at 1250 points. In the list where you combine both, would you deepstrike with only Gavriel and 1 unit of evocators? Would that be able to kill anything?
Your cleansing phalanx list at 940 points seems interesting tho, perhaps with a incantor and everblaze comet as well. I'll play around with that list for sure.