Coir verm.. substrates don’t make your myc produce more fruits. It’s a genetics thing...but ime it’s hard not to get jam packed tubs with cubensis.. as far as spawn ratio idk I’ve never measured it,, I just eyeball. I’d suggest 2qts coir to 1qt colonized grain
4 quarts spawn to 1x 650g block of coir... the end.
Although adding verm wont hurt either, i dont bother cus i have quite a high rh where i live.
Keep at it, if you need a hand just holla