has anyone noticed the slipper pads slipping inside the hex on the spur gear?

I'm pretty sure I sanded both sides of my pads, ft on the rear and stock on the front. Ran on race night, tore down the slipper and both sides of the pads are glazed. Must be slipping on the face of the spur as well. My spur even has what looks like wear marks on it.

I'm running 2 thin washers with the nut all the way down. This is a hi-traction track running 15/62.

All this slip is making my barcodes last quite a while though...

Gotta get the clutch basket...