Just time. I started on controller also as an arc lash sorcerer. But was getting a weird misfire situation on controller when I'd proc raiment of infinite. I'd tp, pull all mobs in, then my character would just stand there like an idiot despite me mashing the crap out of the A Button.

Switching to kb/m took a bit to become intuitive but now that it is I am able to actually demolish groups of enemies that were completely destroying me before.