Quote Originally Posted by Garotte14 View Post
Last, you shouldn't ever be casting Impact if you have a Ready proc. Its 20 more potency plain and simple. Let Impact fall off. I don't have months of testing in a raid environment yet to say 100% on that, as I've not encountered every scenario. But at the moment, I see no benefit of casting Impact over a Ready proc.
I don't follow this.

Where does the 20 potency difference come from? Why shouldn't you use Impact when the "Impactful" proc is about to drop and the "ready" proc isn't, unless doing so would cause you to (i) cap mana, (ii) become imbalanced, or (iii) waste an opportunity for a proc?

Verstone -> Verthunder -> Impact -> Veraero and Impact -> Verthunder -> Verstone -> Veraero are equivalent outside of specific circumstances (such as, e.g., both "ready" procs being up). It just seems a waste to let "Impactful" drop when there is no opportunity cost to using it.