First I want to say I'm not a theorycrafter, I just talk from my own experience so I could be wrong at all.
No. I do this: Pre-potion-> 2 clipped MF -> SF+AA -> MB -> 5xMS -> clipped MF -> MB -> 4xMS (mb even 5) -> Clipped MF -> MB -> VT + DP + SW:P (Potion ends here or after DP).
I always have 3 orbs when I cast MB.
Worshaka, I know Simcraft says mastery > haste. But I think that's because simcraft doesn't multidot. In almost every DS encounter we can multidot and in those cases i think Haste gains importance. Of course, in Ultraxion a heavy mastery build will be stronger, but I also think that in Zon'ozz Hc a heavy haste build is the best choice. And since I'm not gonna reforge for every boss I face (I'm not that pro
) I think a haste build is what I'll make the most of.
Maybe it's true that if I cast more MS then some of them don't benefit from any orb making the DPeT of that spell weaker. But I don't care about DPet but in total damage. If I can cast 4x1200MS (1200 average damage) or 5x1000MS for 6 seconds (MB CD), the second option has a weaker DamagePerSpell but you deal more total damage. Am I wrong? Btw, mb 1-3 MSs don't get the benefit from any orbs but they still get the benefit from AA (+20% dmg).
What's my point? I think 2 extra MS while SF is active + more haste on dots in regular rotation evens the extra damage you could deal having a heavy mastery build while SF is active. As I said, I (prolly) could be wrong.
I'd like to add that having more haste it's easier to me getting the SF sooner (due to Sin and Punishment talent) in order to cast it with AA at the same time.