Stat weights/Best stats for Astrologian?

[xLucia]

I apologize in advance if I posted this in the wrong section.

Anyway, we are 2,5 months into Stormblood, and I still haven't been able to find any lists with the best stats to go for on my healer (I main Nocturnal AST in Savage mode).

Would anyone have an idea what I should meld? I was thinking of CRIT/DET and SpS when either Crit or Det is not doable (which is what I have been doing) myself, since I figured SpS doesn't do a lot for my shields, plus I don't feel that SpS makes a huge difference castwise. But I may be wrong. Or maybe I should go for a different route entirely, and meld PIE or perhaps VIT for survivability?

Are there any Nocturnal ASTs out there that could shed me some light or give me their opinions? All help would be appreciated