Assualt Suit Leynos 2 Ranking System

[SNKNostalgia]

Has anyone "Truly" figured out the damn ranking system in this game?

I have tried many different methods and can't understand what keeps me from getting "A" ranks in certain stages. I am pretty good about not getting hit, but those damn penalties come from nowhere.

 

[Psygnosis8]

I have no idea how those rankings/penalties work, but damn if that isn't a beautiful game. Just my 2 mesetas