I don't know if it was blatantly said somewhere in here. But The new rear Topshafts 'are' and I emphasis: "are" coming with about a 1mm drop on that ledge on the shaft thus 'kinda' solving the original Slipper issue.

The Basket's still do their job better than stock, especially with a 550 can.

(you have to set them down and look VERY carefully to notice about a 1mm-2mm difference in height.)