Quick question about Disc - Mastery vs crit

[Nzete]

If you can manage to have your mindbender out (usually late fight lull) with your hymn plus a shadow priest's hymn, it looks really pretty and blue on the mana bar. Yes, that is 2 priests in a 10 man... oops at raid forming.

On the crit/mastery, I heal with a resto shaman in 10 man. I reforge to crit > mastery and away from spirit and haste. I gem around crit matching sockets with crit/int and crit/spi. I get what I get for stats from there, but I'm taking the crit/mastery gear after the warlock and spriest if they want it.

[tsumeno]

Little update, I´ve decided, that unbuffed ~35% crit is enough for me. With 2-Set and Yulon I´m sitting most of the time at or near 50% infight and thats enough I think. You opened my mind for dropping more spirit I´m now sitting at ~11k with (finally!) PPoP and did very well this ID, no mana problems at all, no mana pot needed. Even on Thok and Malkorok nhc no mana problems at all
Next step, drop to 10k - 10,5k and see how it feels without regen trinket.