a while ago I ran a series of sims and all results at that time showed that mastery was slightly better than haste. Today I repeated that, with a strange result. Haste is significantly better at my current ilvl (558). I have the amp trinket and the legendary.
On a HelterSkelter fight type I get haste=4.6 and mastery=3.63
Even on HecticAddCleave I get haste=7.75 and mastery=7.68
On a patchwerk fight I get haste=4.81 and mastery=4.02
So for all fight types haste is better. I made a reforge plot with a reforge amount of 3500 and up to 2000 points reforged from mastery to haste I have a DPS gain. Is this common or did I made a mistake anywhere?