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Yea, there is something else going on. Your BMG should not need more than 0.5-1mm retract. Also 0.2 PA is pretty high for a bmg extruder. Mine starts making funny noises when I use anything higher than 0.15 and I only run it at 0.1 for PLA.

I would do this: Set PA to 0.1, set retract to 0.5 mm at 70mm/s retract speed. Troubleshoot temperature, and other slicer settings...its almost certainly related to one of those things.