Learning how to properly play AST

[Parawill]

Synastry increases Collective Unconscious as well? I didn't know that, I thought it just increased actual magic spells not abilities? Would love to find out as I didn't realize that, otherwise I'd use it before CU often then.

No.

I would also use Luminferous Aether in tandem with Celestial Opposition to get an extra tick or two of MP, thus getting you more MP in the long-run.