Having recently done a remake to go from a martial to a caster, I think the arcane flux mechanic is -very- cool, and I appreciate it existing, believe me. I enjoyed doing things aside from buffing my pocket WM murder machine and casting haste.
That being said, there were a lot of times where I was just...plinking in the back, casting a cantrip over and over, waiting for a proc that usually only came at the end of the fight or not at all. I think an overall increase of 10% across the board, bringing the totals up to 20% for specialists and 25% for generalists would go a long way towards making wizard game play more engaging instead of it just being "Watch me ward, watch me ward, watch my summons nae nae."