I personally love AB on a tank that's pulling big since then you tend not to waste any of the healing (either the initial potency or the HoT) but yeah in general overall keeping people topped up isn't super necessary and can hurt your mp.

You're on Zalera with me so if you play at all in the evening (EST) I'm usually around if you want a roulette buddy. I'm by no means a pro AST but I'm sure if I saw you play I could give a few pointers.

That guide is great, it really helped me get a handle on everything. It's a lot to read I know but especialpy at 70 it gives you a great foundation.