How big are the mobs (are you pulling big) and why are you tanking them with Sword Oath if you know you have issues? In dungeons lv 60+ other roles have access to more powerful actions that will take aggro from you even if they use Diversion/Lucid (which are like every 2mins on cd I think). You can't trust players through matchmaking to use common sense either, some will attack different targets to the rest of the group forcing you to adapt your enmity direction.