If you're getting different numbers in-game vs simcraft you should look at how many times each spell is cast (and make sure you're matching the priority list of spells).
Hi im having serious problems whit dps, i checked everywhere and they all say the same demono> the rest of the masteries,just loose when heavy movement fight, still im using my left hand to spam spells and my dps is 17k on dummie and my simc says 25k as average. And the max i do is 22k dps when LFR but i dont understand what am i doing wrong i do the rotations well's even if i use metamorphises all the time the max i get is like 22k dps for the time my immolation aura is up. but when get's off go down to 15k-17k.
my nick is emaf from aggra (portugues) u can check it in SimC.
I Simulated whit no buffs from raids
Sorry if it is on the wrong place and at the wrong time