My suggestion for AST

[Valoiz]

Make synastry a "permanent effect" (recast 15-30 seconds) like beacon of ligth from WoW
Reduce celestial oposition to 60 seconds and add some healing potency
Let Colective Unconcious be like other healers barriers
Buff potency for all the cards 5-10% to be relevant
Change party bonus to MIND
Spread out of combat

[VitalSuit]

Synastry would have to nerfed if it were permanent and there'd be no reason to have to recast it.
Celestial opposition's cd should be reduced but 60 is too low.

[Vlady]

Make synastry a "permanent effect" (recast 15-30 seconds) like beacon of ligth from WoW
Reduce celestial oposition to 60 seconds and add some healing potency
Let Colective Unconcious be like other healers barriers
Buff potency for all the cards 5-10% to be relevant
Change party bonus to MIND
Spread out of combat

Synastry is a very unique buff for ff 14 and our best cooldown. It is very potent for sticky tank healing situations even letting astros solo handle tanks in situations that may arise. Bismark EX/A1/A2 are already excellent times that Synastry shines. It does not need a change. Spread is going to be changed with the astro buffs along with shuffle cooldown.

[TheWaywardWind]

Synastry would have to nerfed if it were permanent and there'd be no reason to have to recast it.
Celestial opposition's cd should be reduced but 60 is too low.

For what Celestial Opposition is, I feel like around 60 second cooldown would be fine. Personally I would say something along the lines of 90 seconds, but either way it's very clearly it needs to be cut down by at least a full minute.

[Nihility]

Synastry is a very unique buff for ff 14 and our best cooldown. It is very potent for sticky tank healing situations even letting astros solo handle tanks in situations that may arise. Bismark EX/A1/A2 are already excellent times that Synastry shines. It does not need a change. Spread is going to be changed with the astro buffs along with shuffle cooldown.

the funny thing is though...
with all of astrologians downfalls compared to other healers changing synastry to have 100% uptime with a cooldown to switch targets would make up for all of it without having to change anything else