moving away from the whole meditation idea then, what about a skill that consumes your stacks instantly and does, less say 200 potency per stack, you obviously wouldnt want to use it every chance you got, but at a phase transition that you know your going to lose your stacks anyway or just before boss dies/enrages, hit the skill then for a nice big hit.
would also combo nicely with perfect balence in fights that you dont lose stacks for a true burst.