I personally go Aero III > Aero II > Stone III, mixing in Aero whenever I wanna pop oGCD (Fluid Aura, Assize, Shroud), switch out of Cleric Stance, or move out of boss AoE.

To your PS question, in that particular situation, the Cure II will not gain the benefit of Divine Seal.
BTW, Presence of Mind does not increase Spell Speed anymore, its a flat 20% casting speed reduction, so it'll not affect the potency of HoT and DoTs.