What helps Uriel a lot is her burst having the side effect of bonus damage per charge (which is technically not a buff to burst damage, and thus not bound by the cap). Pre-awakening, it's listed as +85% per charge, with a cap of 5 charges for a total of +425% damage. IE +4.25x normal hit damage. So Uriel can survive hitting the 300% +burst cap. (fellow burst attacker Metatron doesn't have something like that, so she gets screwed by the cap)