What AST cards are you guys using on what roles in your party?

[Keydah]

I'm really enjoying this job but I don't want to be a derp about it. I'd like to establish good habits early instead of getting to 50 and going "...d'oh. why wasn't I doing that?"
Thus, I'd like opinions on what you more experienced ASTs think should be used when/on who.

I've been using (I'm 39):

Bole (damage reduction) = Tank. Duh?
Balance (dps increase) = DPS, but maybe tank at beginning of pull to help establish hate if they're having issues.
Arrow (attack speed increase) = Been using it on dps but I had a tank demanding it in Qarn so now I'm confused.
Spear (recast reduction) = I feel like this one is more useful to RR than to use...But I guess it could be useful on tank if early in pull, before they blow their cooldowns?
Spire (TP cost reduction) = DPS or tank. Usually dps.
Ewer (MP cost reduction) = BLM, WHM, me, or Royal Road if I or the WHM is fine and there's no BLM. I don't see it being useful on SMN/SCH because of Aetherflow.