Does it make the sound go away or just less? I picked up a 1098 with a Corse slipper and did the white lithium trick. Improved the noise by maybe 30% and grabby-ness by 50%. Wondering if that's all I should expect.
The sound stays.... I think it comes from rubbing between the pressure plate and last (i.e. top) steel plate in the clutch pack (the Corse slipper ends with a steel plate and not a friction one). You might try a convex steel plate as last one.