Having some mana issues with my Priest

[Svpernova09]

Flash is your oh shit spell. Spam Heal, use Greater heal for large incoming damage amounts.

[Tyval]

Well went back today, and it was amazing what avoiding the water spout does for required healing hehe.

Killed her first time back today, even with some spastic targeting on second set of add. So that was the biggest help to my mana,

Also as you mentioned, not casting flash heal anymore unless emergency, and moving heal onto my healbot clicks as well.

Do folks use power shield much on non tanks? I was reading up on the power proc, and noticed it says only 1 every 12 secs but does seem to have okay efficiency.