I too have focused on haste, nearly ignoring mastery all together. Over the past few days I have been toying with a MS->MS->MS->MB rotation during AA procs. I noticed an increase of about 1500 in my single target dps from doing this. Usually on the first go through of the rotation I throw a SW

in before the MB to get a touch of mana back, then I spam the rotation until AA has about 2 seconds left, at which time I restart my DoT rotation. I am at work at the moment and am unable to post any logs, etc. But I can say that I did notice a fairly strong increase in DPS from spamming nukes during the AA phase.