Have you seen the Filament melted into the Module massively thread? There are some good suggestions there.
If that doesn’t help, Snapmaker has a section in the manual about clearing a jammed print head.
It does sound like you’re familiar with the process, since you said you dismantled the print head at least 30 times. One of the comments mentioned that the fan might be dislodged, or not spinning, which causes the filament to overheat. Can you confirm that the fan is actually spinning while it’s printing?