I'd do a lot more than that.
Healing buff on Noct since Diurnal gets the MP reduction, lower CD on Synastry again, increase potency of Celestial Opposition so it's closer to a Helios, make Collective Unconscious not fucking suck on regen potency, lower Divination CD by 1 minute. Horoscope I think is a bit weak for what you have to do with it, but it doesn't need (much) more love. Celestial Intersection and Neutral Sect are probably the only skills I'm happy with that you can use reasonably often to decent effect, Neutral a bit less so since it still forces me to GCD heal.
As for cards...old system, new shuffle. Don't even need Divination. I doubt at this point you're going to get away from GCD heals on AST, but nothing you do right now outside of a couple moves feels satisfying.