While I can't be sure on all the details of your situation, I do know this feeling. I love blueberries. And despite doing all the courses, all the methods, with all the right parameters and I still can't grow them despite trying for years.
I have had some success with mushrooms, though. If I had to guess, it's a moisture problem and probably getting dry. Not because you're not watering enough, but because getting some of these commercial strains started may call for more consistent moisture to get them established. For me, it was almost daily watering a bed of wood chips and layers of blue oyster sawdust spawn over landscape fabric. My easiest mushroom, though, was the wine cap or king stropharia. Several bags of mushroom spawn in a pile of fresh ash and maple chips sitting in a tarp in a small depression so the base of the chips were always sitting in water. I've used these chips in hugelkulter beds, my regular garden mulch, and just keeping weeds down usually at one part inoculated and one part non-inoculated chips. I've been able to pick mushrooms from these chips the first year and more every year since. I've added fresh wood chips every year and mixed them in and close the tarp over the top for a while in the cooler months or if it gets hot and dry out. The wood chip pile is also a good source of big mushrooms if you keep it in the shade. Aside from making a pile of wood chips, it's low maintenance.
I've failed on several mushrooms I've tried to start (lions mane, shitaki, chestnut...) but these two just worked. I think it was a moisture problem when I failed.