here's what you can do that will be a hell of a lot easier than what you're doing now. Call it a Poor Man's Tek.
1. Get some wild bird seed (WBS). Cheap stuff, try to find some without sunflower seeds. Get some pint mason jars. make some holes in the lids, and cover one with RTV and the other pack with polyfill (pillow filling).
2. Soak the WBS for 12-24 hours. Fish out as many of the floaters as you can, stir the seed, fish out floaters. Repeat until you have almost no floaters. Drain, rinse real good, then put it in a pot and cover it with water. Bring it to a boil SLOWLY then simmer it until you start to see some of the grains burst.
3. Load up the jars about 3/4 of the way. Now, take the jars and put em in a pot, and add water up to about the grain level that's in the jars. Bring this pot to a rolling boil. Boil for one hour. Let cool overnight. Around the same time the next day, do this again at least 3x. What you're doing is allowing bacterial and mold endospores to germinate then killing off the fledgling contaminates.
4. Once #3 is done, in a sterile environment like a SAB, inoculate your jars with your spore solution. Put the jars in a warm dark place to fully colonize.
This will get you spawn much faster, and easier, than what you're doing right now
@Observer. Spawn is the last place you can really take a short cut with growing mushrooms given contams will win almost every time if you're not using 100% confirmed sterile media and aseptic techniques. I know it's a bit more money investment but without a pressure cooker or autoclave, and laminar flowhood or dedicated SAB, you're fighting an uphill battle.