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micro all metal 3mm retract @40mm works great for me
load /unload allways 210 & push in before pulling out
cura 4.4 & genuine bmg/ bowden ender5

also use 3mm on the micro swiss 300 cr10 with red alloy extruder setup.... just a though you do have a genuine one and not a clone ? a way of telling is if you have holes for the heat block in the top block/part ...Only a thought but there's plenty nocking about and i fell into that trap a while back it had been reboxed the cheeky ebay seller