Hi guys. I main Mistweaver, but for my guild's weekly Flex raids our comp often has me tanking just to get a raid going, and I'd like some help optimizing my gear. This is regarding 15-to-25-man Flex raids (14/14 so regularly tanking Garrosh). My armory is here, but it's likely I'll be logged out in my MW gear so here's a link to an Ask Mr. Robot profile with my current Brewmaster gear instead.
The first thing you'll probably notice is that my gems are all over the place. That's because I'm kind of confused how to gem. Don't worry, I read the guide, but I'm a bit confused. It says to gear for Mastery/Stamina over crit if I need more effective health, but it doesn't really say how to determine whether or not I need more effective health XD... I'm also unsure of the threshold of max HP versus mitigation at which I should gem Mastery or gem Stamina.... It seems to me that Stamina gems increase my max HP proportionally quickly, but Mastery scaling is kind of bad (8.4k rating for +8.73%? And the base stagger is 20+5% without raid mastery buff? Edit: Derp +20% shuffle too). I have seen around that Stamina is mainly for high-magic-damage fights, but Mastery looks weak at first glance in comparison for surviving a spike, and Garrosh definitely has a fair amount of tank damage from the magic DoT. I assume that since I regularly tank large raids, and they're only Flex on top of that, that the extra raid damage from Crit isn't necessary (which is also why I'm using tank legendary items), but ultimately I'm unsure whether to grab more Mastery or more Stamina... Can someone give me more insight into this?
By the way, just noting here that I cannot upgrade anything and my gear is kind of shoddy and random item levels because it's my offspec so I only get stuff our Rogue doesn't need or that I win from personal loot, and can't spend any valor on my gear (Though I have one upgraded ToT trinket from valor capping at the end of last tier :P)
Thanks in advance for any help! (And don't be afraid to tell me something I said is totally wrong ^.^)