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Thanks for sharing your settings. That is why I posted here. Hoping the discussion helps others.
I forgot to mention in the original post that I recently converted to “direct drive” by mounting the extruder motor onto a bracket fixed to the extruder carriage. (https://www.thingiverse.com/make:718679, printed in carbon-fibre filled PLA, with some additional stiffening.)
My Bowden tube is now about 20mm long, between the metal extruder cold end and the Micro Swiss input.
I was using 6mm retraction at 25 mm/sec with this configuration but having clogging issues with the hot end, with brand new PLA filament. While printing at 205degC, I could hear a graunching sound from the extruder which eventually stopped extruding in mid-print. Evidentially, that sound is one of the clues.