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I'm using the all metal hotend (no ptfe tube). My retraction setting is 1.6 mm. ,temp is 215 C and feed 98%. However take care if you're using CURA because at the "default" end g-code it will retract an extra 5 mm. This could block your extruder when the filament cools down.I limited the extra retraction to 1.5 mm. and until now it prints perfectly with very limited stringing .
Good luck!