I guess then I can just say have fun playing BW, maybe you find a way to win consistently vs 3 hatch hydra without knowing or even having an interest in knowing how to 1 rax expand properly.
May I attempt a translation to actual advice?
Your build is wrong, and correcting this will benefit you more now than getting into details about M&M vs. hydra.
As a high level player, I think you've forgotten the intermediate steps between novice and your position. See: Curse of Knowledge. Nobody opens the box (or downloads SC:RM) and immediately starts the Ayumi Build.