Yes, Uriel is on my list to awaken, but I don't main fire, so it'll be a long while before I get to her.
Yes, I plan to rotate my R himes for the lower floors. When I feel like I am hitting my limit (don't think I am near strong enough to clear all floors), I will field my 'functional fire team'. After that, will field my light team (I main light) to see if I can clear one more floor without the fire bonus. Any noticeable flaws with that plan? This will be my second tower event, so please be patient if my planning seems off.