Been doing some research and it looks like at a certain ilvl mastery becomes greater than haste. In looking at top level fire mages (Kuznam and Vykina) it looks like they are doing their openers and AT macro times with Mage Armor on. It also looks like they are going for haste up to about 5100 (12% ish) and then going for mastery.
Can anyone else verify this stat priority and that this definitely increases dps? Their reasoning for using Mage Armor during AT openers and burst phases before Combust is because the procs you get from BotH and Cha Ye's give you int which translates to crit which makes up for the lost crit% from molten. Anyone tried this and can verify it? I am definitely playing around with this on dummies right now and it looks very promising. Obviously you need the Armors glyph to avoid any dps loss from casting long ass armor casts.
Thoughts?
EDIT: I also just looked into the new soft cap feature on AMR and it shows that 5036 is what is require for an extra Combust tick. The next extra tick is at over 7k (basically unreachable without it being priority). I believe this is why top level mages are going for mastery instead.