400 on a Halone is perfectly doable on dungeon mobs without any buffs and in Sword Oath. In Shield Oath, with FoF up you can hit up to 400. On Asclepius add, with 4 stacks, you can even break 1k! Anyways, if you're finding tanking boring, you should play something else or find a different way to play. Pull more adds, maximize your DPS, add additional cross-class DPS skills, sneak in Stoneskins in between ability casts; there's plenty to do as a tank.