almost felt like 3 dps run, almost hit cataclysm had to ignore the little tentacle adds the 2nd time they spawned to avoid cataclysm haha
as for the haste thing, may mess with it myself, although your rotation almost turns into spamming arcane shots nonstop when you get your 4 set bonus proc (more so on DW, or during BL, and or with rapid fire because of the obscene focus regen) which could make sting fall off. I still can get focus regen so fast I get to 100 focus before I even get to fire the 2nd arcane shot at times ;/
They should of just gave us the ICG style tier buff of +15% damage to hunter+pet imo
Oh and the haste to mastery, don't forget that minimal gain, on DW, is pretty big considering the +damage buffs you get. The uhh 20%? from blue aspect and the +200% when one the dragons lasers DW's arm/tentacle thing for cataclysm. All those little additions really adds up.