I tank as a PLD cause it's braindead easy. That being said... on PULLS:

I sometimes pull a group with Provoke as opposed to Lob because it has a further range and it's off GCD and I can Flash right away.

I never double Flash to start a pull. More specifically I Flash as the Blind debuff from each Flash falls off. After they're immune, I'll Flash as needed.

I rotate my 1-2-3 aggro combo. I'll 1-2 one mob and then 3 another. I do that throughout a pull as needed.

I don't pair defensive buffs unless things are looking dire. Otherwise I only pop one at a time.

If Scorn is coming off CD and the pull is almost done, I'll save it for the next pull (so I can Lob right into Scorn)

That's just some of the small things i do. Oh, and NEVER pull a group, stop, AND THEN move to the next. Be decisive.

Good luck.