Your mushrooms are getting light below the layer of casing (not good). Wrap the jar with foil up higher and even with the top of the casing. This will solve the problem.
The mushrooms may still yet grow up through the casing. Wait it out.
Everything else looks good. Do you have condensation...
This is the pressure canner I own.
https://www.walmart.com/ip/Presto-23-Qt-Pressure-Canner/2625289
It fits 6 each of the 32 oz. jars that Canndo describes in his method. It's $95 at Walmart and I believe I picked it up for $75 at Restaurant Depot.
I've used it countless times over the last 2...
The dry weight in the above referenced photo (the trays drying) is 30 grams. Just over an ounce.
From a different flush, here's a photo of a cubensis from a jar that is just about to kick. The last flush from a jar is generally a GIANT tree of a shroom
Your inclination to start small is a good one.
You'll make mistakes and learn as you go and probably have contaminates the first time. Don't set a harvest goal but rather have a goal of getting SOMETHING to grow.
Don't get discouraged. It takes a bit of practice.
Keep us posted.
My advice to someone who does not want to buy a pressure cooker is to BUY A PRESSURE COOKER. All kidding aside... It's a MUST HAVE
The science of WHY lies in the difference between sanitizing and sterilizing. If you boil something for a "really long time", all you do is clean it really well...
Hello "awesomegrow420"
Welcome to the thread and feel free to poke around.
Your best bet for pf tek questions is to inquire on a pf tek thread. This thread is the anthesis of pf tek and is designed to be a SUPERIOR ALTERNATIVE . Read through it and give it a TRY - you won't be disappointed...