I've tried to scale down a single fruiting medium to 100-200g, and it keeps failing time after time: at best, I get small needle-sized fruiting bodies (hypsizygus tessulatus, post picture) or primordia and then small malformed underdeveloped fruiting bodies (pleurotus eryngii, inline picture). Then development just stops. Medium is enriched (sugar) alder chips, contamination starts developing long after growth is stalled. Is it really scale problem? What's the reasonably smallest batch size?
I haven't tried myself but my understanding from reading Stamets is that you're supposed to cut the log and move it to a wood shed or something right away without letting it sit on the ground for an extended period. Alder is supposed to decay much quicker than other hardwoods as well so it's not used as often.