510 Potency DPS + 1000 Cure Potency (That can crit) is insanely strong, I'm all for sustain but we don't need tanks getting more sustain just to keep higher ground on War/Pld, however I wouldn't mind Souleater cure potency increased 300 > 400, or CnS with a 300-400 cure potency. Gaining MP would only fuel more DPS which isn't needed.
HoC isn't as powerful as it's made out to be. Bloodwhetting needs tuning on it's AOE, maybe cure potency reduced. Holy Spirit cures reduced to 300 potency possibly problem is Holy Circle, Circle is fine since it's proc per pop, not proc per hit.
The only reason they're so strong the sustain is because content isn't threatening enough, the sustains blitz through them.