The higher MP cost you'll have by letting the tank get a little lower and only using Cure 2 instead of Cure would be compensated by having Assize on a 48 seconds cooldown. You don't need to spam Cure 2, just use it 3 times in the 48 seconds you have before using Assize again. What they did by giving Cure 2 100% lily proc rate is kill Cure 1, there's no incentive anymore to use it unless you already have 3 lilies.
I think Cure I is the spell that should give 100% proc on lilies, not Cure 2.
