Quote Originally Posted by rocheetbombe View Post
The potency applies to what your stats are at the initial time it's cast, never during. I tested it mostly with Regen. If I cast Regen, then use Cleric Stance, it still ticks for the same general number. But heavily decreases if I cast it with Cleric Stance already on.

Same goes with defensive buffs. If you receive a DoT, THEN use a defense buff, there's absolutely no damage mitigation versus the DoT.
I just checked, you are correct.

However my main issue is that, while casting Bio/BioII/Miasma/Shadow Flare + Bane takes 10s ~ a WHM can weave in and out and cast Holy when needed and it even acts as a defensive CD with the stun.