I juat realised that the MP cost for AST spell is almost the same with SCH and WHM.
The cost is around 10% lower compared to WHM and SCH (lower cost is only applicable for Benefic 2, Helios, and Asp. Helios).

AST should have lower MP cost for its spell due to limited option to regain MP (also no MP from Ewer anymore).

Maybe reduce the MP cost for all AST spell (include damage spell) to around 25%?
Or
Give us an additional way to gain some mp back (like 5% MP gained from using Play?)

Ref:
https://na.finalfantasyxiv.com/jobguide/astrologian/
https://na.finalfantasyxiv.com/jobguide/whitemage/
https://na.finalfantasyxiv.com/jobguide/scholar/