Chi Brew
Actually, they changed how pre-fight Expel Harm works. You cannot activate trinkets or dancing steel procs outside of combat now. Or at least, despite starting every fight with 3-4 chi for months/since 5.4, I never have managed to activate either. And I think I did a bad job of describing what I meant - I would be using the 2 chi brews after I am on the boss/the fight has started. Also I'm 95% sure that Xuen does not snapshot agility, but updates dynamically.
http://www.wowhead.com/item=94512/#comments
http://www.mmo-champion.com/threads/131 ... hot-or-not
Virtually everything I've read on this says that while Xuen definitely benefits from agi, he doesn't snapshot it.