Healing is weaker. Shields are stronger. Total potency is higher.
You might see a heal of 1000, but your shield on aspected benefic is now 1300.
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To be fair to you, no one has actually proven that abilities that state "Nocturnal Sect Potency = w/e" actually gets the boosted amount from the Sect bonus. It would make logical sense if it did, but this is S-E we're talking about here who can do weird things with their programming.
Does your AST have the exact same MND / DET / MD as your SCH? There could be a minor MND difference because different jobs and the weapon secondaries could affect your DET value. This could explain that 100 healing difference. Screenshot of your stats + heal amount would be nice to see too.
This has been something that's been itching at the back of mind for a little bit so it's something I was intend to test for a while but never got around to it. Now's better than never to prove something, lol.
Changes to AST were needed, absolutely. However, I feel like they went a bit over board with them and buffed every aspect of AST (baseline heals, cooldowns, and buffs). I feel that AST+AST might be a very likely thing; Synastry is likely the most powerful tank CD (+60%~ healing on a single target), CU has become a better/more potent version of Asylum/Sacred Soil, Nocturnal shields are now more powerful than SCH's (combined with having a more powerful Cure II and Medica in Nocturnal, and access to +60% healing makes A Bene a much safer option than Adlo), and longer DPS buffs from cards.
I think the changes were 100% needed, but I have a feeling they went a little overboard with buffing baseline potency, cooldowns, and card buffs.
Stats are identical, gear is identical, and weapons are the same ilvl. Sch actually has 12 less mnd than ast (sch is 908 mnd, ast is 920), but still getting about 100 points more (it's not 100 potency, but rather A.Bene is about 3.9k~ in total while Adlo is just over 4k).
Any DET on either weapon? Same ilvl doesn't actually mean same secondaries.
With that being said the 12 MND less but doing more healing kinda proves a point at this juncture. I'll probably end up messing around with this tonight just to get something more concrete.