Yep I agree with Merc on the ruby strategy it's the only one that's ever worked for me.

Are you healing using repeater regions Zub? Like with Healbot you can independently heal the drakes/team easily.

I have that problem of my healer getting 1 shotted by something mysterious every so often. Put your healer pretty far back and that seems to minimize it. Keep healing also just make sure everyone is topped off and save your evasion for the phase shift.

Good luck man.