Because I'm interested in how to be better in Mythic+ - Here's what I've learned so far in 7.2
Right now I'm stacking Haste & Mastery, although I'm wondering when to stop stacking mastery and instead focus on crit (if at all). I find that the haste really helps me top off the group. I'm using Unison Spaulders & legendary feet. I think the extra buff to trance helps but I'm unsure on the effectiveness of the spaulders since I'm rarely channeling soothing mist.
I'm 895 and having trouble with Mythic 9+ and had a lot of issues with Grevious affix. Mythic 9 Helya was a nightmare.
Also open to trinket suggestions! I currently use Flask of the Solemn Night (880) & Etraeus' Celestial Map (890)