Look, Sims are great as far as evaluating certain setups, but the most important thing is ingame testing. You aren't going to play as well as the Sim, because you have to take into account lag, encounter mechanics, and even player skill. If 9K haste is too much for you - then don't use it. I'm personally more comfortable between 5 and 6K haste, depending on the encounter.
Right now, Windwalker is incredibly gear dependent. If a 510 monk, for example, has RoRO and gets godly procs and uses their TeB perfectly with it, they can easily out DPS someone a few ilevels higher than them. That + our 4set are what will cause you to see the most change. RoRO makes us scale almost too well with secondaries. And, keep in mind to that SimC has its bugs. There's really just no perfect way to evaluate a setup, other than with logs (which, even those are flawed because they are highly dependent on player skill and the strat used for the fight).
Edit: By the way, nice mog