So I have a question for you about Wreath of Lightning. Would it be more beneficial to run the wreath over Pain Enhancer due to the 25% movement speed bonus? Granted this is for a little lower rift than what you run, as well as group play not solo.
I have looked at the scaling for both, while Pain Enhancer starts out with a higher % damage done, Wreath of Lightning scales better in the long run giving you more damage per second. Wreath of Lightning ticks ever second, where as Pain Enhancer puts on a 3 second bleed. I tested the Wreath myself to see what the up time was on it, and I never saw it fall off when I was in a good rift with mob density, I always had lightning shooting out hitting things.
For higher GR you need focus+restraint. Wreath of lightning is only for speed rifts and bounties I suppose if you don't need toughness from Esoteric you can use Wreath but pain enhancer has no place in this build worked well with the old Reakor though