[weedburner]

Maybe the clutch wasn't broken in yet, that clutch should be fine at that power level. If the surfaces were freshly machined I could see the organic side pulling loose with too much grip while the metallic side was still slipping.

If it's pretty even 50/50 street strip, I would use that same PP and step up to a 900 series iron disc. Engagement would be a little harsh, but harsh engagement can be mechanically buffered without too much trouble.