Stats weight confusion

[shadow]

Hello!

I did some sims for my demon spec and i got the following results on stats weight, while going for full mastery reforge/gemming:

my mastery is at 18.26 atm and haste 13.39 (unbuffed)
haste=1.6432
mastery=1.3893

that was done for 50000 iterations and 500s length

problem is that the results i get after dropping some good amount of mastery for haste (and i reach around 15% mastery) the dps goes up...wich i find weird considering that mastery is so good for demons now.

should i go for it? or should i stick with full mastery due to the fact that most fights are very short now and i would benefit from it more while in demon form?

[Hermanni]

Can't say anything without armory link.

[shadow]

sorry, here it is: http://eu.battle.net/wow/en/character/alakir/shadowscr%c3%a8am/simple

[Hermanni]

I can't really imagine haste being better at that itemlevel so I'd like to actually see the sims.

Sorry for taking a time to respond, I checked this mid-raid and later forgot about it.