[toddhollander]

If you have a soft spring, you need less rebound damping so the wheel can come down from being compressed more easily. An overly stiff spring shoots it down forcibly and that's when you need rebound damping. A soft spring needs more compression damping so it doesn't bottom as easily, a harder spring needs less compression damping. That being said, the above adjustments make sense to me. Ideally you start with the proper spring rate, easily determined by how much sag you have when loaded. I think the Penske guy said my 2018 Ducati spring had a 385 lb/inch. spring rate. Nitron recommends a 450 lb/inch spring rate for me at 225lbs.
That's what i put on the Penske. I still haven't tried it yet, hopefully picking the bike up Friday.

 

[toddhollander]

Makes sense. Why Penske over Nitron?

PENSKE is near me and built a great shock for my son's SV650. Unfortunately they had no experience with an XDiavel. I am the beta tester.