In the ideal situation where you are on a single target boss, what is your rotation?

I was testing

Aero III > Aero II > Aero > Assize > Stone III > refresh Aeros > Fluid Aura > etc

It seems like WHM doesn't have enough time on trial boss to put out high numbers.

P.s. Small ask, does divine seal/presence of mind effect spells cast while the buff is active or when the spell is cast? Like if I case Cure II when I have divine seal up but it fades before the end of my cast will I still get a bonus?