Next batch try molasses, green grass clippings, your myco supplement, and worm castings....make sure the bubbles agitate the bag. If this doesn't form a proper head then something else may be at work. You don't have an inline chlorine or salt filtration system do you? I know you said you're on well water, but so are my folks and they didn't realize there was an in line chlorine/fluoride filter until after a year in the house.
We will get this figured out.
By the way, drop the initial molasses to 1 1/2 tbsp for 5 gallons...molasses can be bacteriostatic in certain amounts...( don't really think this is a problem, but humor me)...do this batch and let me see the progress.