For dungeons even with really good DPS I do:

Fight or Flight
Shield Lob
Circle
Rage of Halone x2 to spike threat with Spirits thrown in there somewhere.
Sword Oath
Goring Blade
RA combo for the rest of the fight to maximize my damage while refreshing GB as appropriate and using my oGCD dps moves whenever they're up.

I probably should use Halone more but dungeon bosses don't hit hard enough that I worry about the debuff overly much. Even when I have really geared dps (20k+ hp) I rarely ever need to go back to Shield Oath to get a threat lead again.