Divine Veil

[Naryoril]

I suggest creating a macro that announces in party chat that you are using Divine Veil so it will be easier for others to know to group up near you and for the healer to trigger it.

Please don't. I hate those tanks who make macros for every skill. It might work in a static where the healer and everyone knows from the sound effect alone what's going on, but if you have to read it's often useless. Either it's not really needed because it isn't that critical, or if it is really critical/needed, the healer won't have time to read the chat. Keep those macros only for the really critical stuff, like Hallowed Ground for example.
I recently had 2 tanks in A4 who announced convalescence with a sound effect macro for gods sake!
And divine veil lasts what? 30 seconds? If it wears off because you didn't get a heal in 30 seconds it clearly wasn't necessary and thus didn't matter anyway.

Just do what repoe said, use divine veil in the right moment.