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?
The long fruiting bodies that just abort are because it’s starving for oxygen. Remove them from the glass jars and put them in a box that’s kept humid (like a plastic container). Look up “shotgun fruiting chamber”. Or you can crumble your entire cake into a bin with some coco coir (contamination resistant) and the mycelium will spread and quickly start forming hyphal nodes and then fruit properly.
You got this!