The muffining you are seeing is the crude decarbing. If you watch your processes closely enough, you will see the difference between solvent bubbles and those produced through decarbing. Solvent bubbles are big, while decarb bubbles are really small.
The biggest reason you are likely not getting sugar to form (aside from some process issues others seem to be trying to help with) is because you are decarbing. THC doesn’t like to crystalize; THC-A does. If you decarb, it doesn’t want to crystalize.
Some reading to help:
Lots of people have been talking about how to do this for a while. There’s some good info on the site. Also, sorry it took 20 days to notice this @Brukang.
Edit: and @bogue, the above links may help you too. There were a ton more results my 30 second search produced as well.