First, why doesn't the Healer get the Cure domain as a free domain? Having a healer who can't spontaneously heal because he picked a different domain at level 1 seems funny to me. I doubt it would overpower anything to give it Cure Domain plus one more at level 1.

Second, why do 3 of your new healer domains have Heal, Mass as their 9th level spell? Seems kind of a waste, given that's the primary method for spontaneous casting for the Healer.

I'd also recommend making the Advanced Learning spells castable spontaneously. Additionally, since you have a focus on metamagic here, allowing metamagic to be applied to spontaneous spells without the extra cast time being incurred would be pretty nice.