I think you need to stop posting and review the forum rules.
Ty for the replies.
I just kept stacking haste because i was hesitant if switching to mastery at a certain point really was better, and there is no mention of switching to mastery in the Winter of Discontent guide. In the "410 dw BiS list" everything is also reforged into haste, including mastery => haste reforges. I would imagine that set ends up with even more haste than i have.
I guess i should try to drop some haste (to 2k or 2.2k), stack the rest in mastery and see what happens.