Shadow Priest reforging assistance

[Loregasm]

Once more, I am in need of some assistance, and I come to the lovely people in the MMO-Champ Priest community to ask for it! I've recently made some upgrades to my gear, which required re-simming and re-reforging according to the new stat weights. The problem is, my stat weights came out weird. I'm not saying they're wrong, but they're different from what I expected. Most notably, mastery is higher than anything else. When I plug these values into Wow Reforge's calculator, the output it gives me leaves me below the 30% haste margin. I'm fairly certain that I don't want to sacrifice that much haste for mastery, so I turn to you guys.

I ran the sim in Sim Craft with 25k iterations on a Patchwork style fight, with all the buffs/debuffs I can expect from my 10 man raid (everything but DI, FM and the crit debuff). Here's my armory: http://us.battle.net/wow/en/characte.../Gennie/simple

The stat weights I got from Sim Craft are:
Int: 3.2758
Spirit: 1.7160
SP: 2.5127
Hit: 1.6482
Crit: 1.5897
Haste: 1.5348
Mastery: 1.6454

Right now, I've done my best to get close to the hit cap and stay over 30% haste, but I'm sure I can squeeze some more damage out of this set of gear. Any help or suggestions on using Sim Craft would also be greatly appreciated.

Thanks in advance!

[Zuziza]

Stats normalized to Int:

Int: 1.000
Spirit: 0.523
SP: 0.767
Hit: 0.503
Crit: 0.485
Haste: 0.469
Mastery: 0.502

Ranked highest to lowest:
Int: 1.0
SP: 0.767
Spirit: 0.523
Hit: 0.503
Mastery: 0.502
Crit: 0.485
Haste: 0.469

Since you simmed Patchwerk, it's showing how your stats would look if you never have to move during a fight or suffer any interruptions. That is nothing like Firelands, and it's short phases of a fight at most. If you didn't have to worry about moving, MB can be cast on CD without any issue. Mastery then rises in value, but it's artificial because it doesn't reflect the type of fight you're doing.

In a fight where you have to move a lot, you don't get to cast MB as often as if you weren't moving. Thus, DoTs weigh in more for your DPS. You also have fewer MF's going off because of movement, meaning fewer orb procs, which means less benefit from mastery. DoTs benefit most from Haste: everything ticks faster, even if you don't hit any special bumps along the way for an extra tick.

My suggestion is to run more sims that reflect your role for the fights. If none fit perfectly, you can average them out between two styles (Patchwerk and HS, for example) so it's not as biased as it would be just looking at one sim.