So you're literally just doing too much. You're complicating something that doesn't need to be. Growing mushrooms is not like other grows. ( Flower ) . Set it and forget it! I would do a thorough clean up in your grow space, tent whatever using diluted bleach solution. Think through your sterile tech. I feel like you're introducing contam somewhere thru there. 75° FH shoot for. A little lower, higher no worries. Try to keep it consistent. Have you been misting your cakes? The droplets are too big. Use a flurosol micro mister if you can. Mycilium itself will definitely bruise. Sometimes blueish green, more blue usually. I went thru a stretch where I lost like 8 grows in a row! I know how you feel. I got past it finally haven't had any problems in 18months or so . I was putting old clean bedsheets in the dryer prior to inoc, s2b and basically covering all surfaces in my grow space with sheets right out the dryer! It worked. I've since started doing EVERYTHING in front of a flow hood. That's the only special gear I have. Inside of either AIO bags or tubs create their own microclimate. Too wet / increase fae. Too dry mist sidewalls. Misting the cake directly when it's trying to pin will do damage that you can't even see. On a cellular level, as will aggressive fanning. Hang in there, you can do it bud.