The stamina is fine on these abilities. You know you dont have to constantly drain your stamina right? It would be a good idea for tanks to try and keep their stamina at 1/3-1/2 full in case of emergencies.

I think the stamina system is OK, it needs to be more responsive though. There always seems to be some sort of delay between when you press your action and when it executes. Probably more of a battle animation issue, but w/e