I had this problem fitting heavier gauge nylon tape wounds on a Harley Benton fretless acoustic . The silks had bunched up towards the ring so I trimmed them with nail clippers and my moustache scissors and then gradually crushed the leftovers with mole grips . Just a pinch at first , rotate 60degrees , repeat till 360degrees and test . If still no joy decrease the mole grips gap by 1/8 turn and try again . When I finally got them down to a suitable diameter and they tested okay I wicked a little superglue into the silks to keep them there and spun them through a pinch of wet and dry Emery paper once the glue had dried to smooth them off . A smear of candle or beeswax helps afterwards for fitting/removal .