My last post was deleted because I didn't seem to "elaborate much" (really thought it was enough).
The thing is, would you risk your entire party to heal 200 extra lp? (assuming you manage to have 1000 energy dmg) You won't even be able to sustain yourself and will end up losing all your mana/life in 1 min or so.
I personally took Divine Healing: it has 0 cast time and with RP it reduces EP cost by 100%. But with RP Power it heals quite decently, arround 2k+ if im not wrong and still very low ep cost.