I started having the same issues and got a lot of the same advice that you did. I dried filament, switched to a hardened nozzle, messed with temps and other settings, etc. The one thing that seemed to work for several people was cleaning the gears in the extruder. Remove the filament cutter to gain access to the gears and blow it out with some air. I haven’t tried this yet but will within the next few days (I’m out of canned air). Just thought I’d throw that out there as I continue my search for a solution also.
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