Arms Warrior - Optimization, Stat Priorities

Fellow wielders of two-handed awesomeness,

I am kinda struggling to understand Arms Warrior as I keep pushing and optimizing... when I look at guides, compare with other top Arms Warriors, and do simulations, I get no clear understanding.

Interesting is that simulations seem to be totally off at the moment, at least for me... they always recommend me to push for more Haste, prioritize items with haste - while I see lots of other Arms Warriors push for more Crit and keep Haste lower (mostly at around 11%) - So I now adapted the gear and funny enough, suddenly all my simulations also show more dps than before, even though previously it was not recommend to swap any gear pieces.

So either something is off or I am missing something :O

Edit: Just checked again and did two sims, first with my "old gear" comparing the new gear, raidbots telling me this is my top gear: 14300 dps

Then putting on the items manually, doing the exact same sim again: 15000 dps

An increase of 700 dps just being ignored by raidbots... ?