For me, My water eni has become a better healer, and I still heal a sizable amount with sadist mark and 400 with Massmark.
I think the only problem I've ever had with my eni is when my rebound "heals" a mechanic instead of an ally. But I can still easily take care of most dungeons, my only issue at the moment is Black Wabbit, because I need more earth resists or i die hard.
Fights are usually fast enough that buy the time you have 30 propagator you just need to finish the enemies off, and in the fights that do last longer (ubs) why not use 3gangrenes instead?
If I were fighting Moowolf, I wouldn't bother with gangrene, I'd rather save it for damage.
Magmog? probably go for the psychosis flask for -% damage,
Black Crow? Probably Gangrene.
Dragon Pig? Psychosis Flask.
Excarnus? Gangrene or focus on saving stacks for max damage.