Did you consider that THM might just not be a class for you if you don't like spike damage that requires management and "charge time" (other words for "standing still to recover mp") ?

Personally, I think it's fine as it is now, especially considering what's coming in future patches. With Convert and more MP regen, it should be well balanced with other DD's for longer fights, and THM is already the best by far for quick battles / burst damage.

Just be careful of what you ask for, of the nerf stick might hit you !