You can queue infinitely to test it over and over so i figure LFR is better than sims because of the raid environment, granted its LFR but you get what i mean.
I used arcano 860/bough 865, Conf/MI/FO/UM/CiS. I used Koralon and the chest Belo'vir, no legendary bracers/ring, no food/flask, only lust.
LFR Nythendra i did 418k after i adjusted my muscle memory to use Scorch at 30%. Pre patch i would be doing about 300k? 320k? I don't remember.
LFR Guarm i did 394k, which is a huge improvement from 7.1.
I feel like we crit more, FBlast was available very often, MI and Combustion is easy to pair since they share the same cooldown. I don't quite like Cinderstorm though, I will try Meteor and update this post.
Rotation I used is the same opener except no RoP so once Combustion wore off it's the usual fireball/fireblast/pyro. I love using MI, had to move a couple times at the start of a fight but since i was using MI, i just moved, no problem.
I'm 877 ilvl btw.