I have 10.5k spirit, 30%crit, 40% mastery and 4% haste if my memory serves me. I had to really be careful of using shield much or I will go oom. I use mind bender on cd via a weak aura. I can usually squad just enough maw for a fight it with little to spare if another healer goes down, I am now main spec disc from Holy. Are other discs just having just enough mana?