My previous proposition to reduce cd of skill which give 10 NP to 10s. I take it back . With 30s it allows you to do some burst aoes and that should be enough, they have good dmg.
The only thing I would suggest is that you reduce the focus costs to 30 or something like that. Because you can run out of focus pretty fast atm if you don't have dwarven ale up.
But overall I agree. Aoe damage is pretty good but "burst" (if thats what you wanna call it ) is non-existend.
Greetings.