Get to level 57/58, go heal The Vault last boss and open your eyes people. Your lightspeed 'fast heals' which is on a 150sec cooldown ain't gonna cut it.

The party takes so much AOE damage (during last phase every 3-5 secs he AOES on top of smashing the tank) that what you need is raw healing/mitigation. At that point your priority is to keep everyone alive, not to have your fancy cards reduce TP cost.