As for OP,
You're better off going the direction Shax is onto. Focus on the gear that will give you better results in terms of dps, and you won't be a liability to your raid/group in that regard.
200 dps, Celestial Gaze spamming pom is the worst.
Many priests will mindlessly just spam it whenever the see tank on 90% hp, which I don't agree with.
Ordinarily, the tanks will swap when they go near 50% health, and by then your Celestial Gaze was nothing but a waste.
Save it for when you see a tank in trouble.
And keep some healrating gear in your bag for those fights and special occasions you truly can make Shimmering / Emmisary / CG work in nice ways.