Be careful
It seems that the Exorcism Glyph increase the cooldown of exorcism to 19,5 s and it matters because it gives you Holy Power. So I prefer using the two Word Of Glory glyphes instead, that I only cast for burst DPS under Holy Anvenger and Holly Wraith and ideally at the end of Ancient King (the pet)
Those burst having a different GCD, I use /Macro to cast them together.
Am I right ?
Also, what do you think about Haste priority under critical strike ? With Holy Power given by so many casts, and passive abilities proc on automatic attacks ?