I have personally tried stam stacking while capping exp, pure mastery, and a balanced approach to gearing/gemming/reforging and I personally feel that when I hold 180k unbuffed health and then going mastery while strategically taking socket bonuses and reforging for the exp cap or close to it is the best way to go. For normal modes and last tiers heroics I feel that the balanced setup is best. Not reforging away all of my avoidance has really shined on Baleroc when I can take the entire devastation phase pretty close to solo. But I don't have a healers perspective because ruff and bash dont pay attention. They just think prydain is squishy is hell and I'm fine to heal on whatever we're doing. That prolly has something to do with the amount of cooldowns I have though. We'll see what happens when we get into heroic modes.