Stoneskin use.

[Atoli]

I apply SS at start and after every pull on the way to next one. I feel much more comfortable knowing that I'll have some time b4 I need to heal anyone so I can dps in peace.

Same. I pretty much keep up SS on everyone outside of bossfights so I can dps in peace. Of course, only if I have the leeway MP-wise.
In bossfights, I apply it once to everyone before the fight, but only reapply it on the tank for longer stance-switches.

I'm always kind of annoyed by healers who don't reapply Stoneskin during dungeon runs even though they neither are short on MP nor are doing anything else. Just seems lazy to me.