Follow up to my own post.
I equipped Emerald Dreamcatcher, got my haste in the 30% region then simmed with AMR gearing strategy.
This gave me a strategy
Selected weights instead of Machine Learning
It had Haste and Mastery both at about 13 which only gave me < 15% haste or so
I kept upping the haste number until it gave me desired haste. Ended up changing from 13.25 → 29
With this gearing strategy I now get an 899 ilevel (vs 904 for my aoe gear)
http://www.askmrrobot.com/wow/simulator/report/9058f1d24da7438299989f10c2077e1f?weights=true&strategyId=b1229b7e03f54139823bfd1e6f191795