I have fitted springs with a higher rate to the rear because of the often heavy luggage loads that we carry. The dampers only have adjustment on compression and I have the feeling that I need to increase the rebound damping rate to compensate for the higher rate springs. I will probably remove the dampers over winter and send them to SSL to get them serviced and adjusted as appropriate.
Seems odd Peter that the dampers SSL provide are only adjustable for
compression given the greater need for rebound damping. I don't think the dual rate SSL coilover upgrade to factory five link I have would offer the improved compliance to road surface that it does if it created greater compression damping. You can actually feel the initial softer springing static, whilst pushing down on the bodywork. Surely SSL's own 5 link conversion won't be so different.
I just went and checked the manual. The adjust on the Quantam OneZero shocks that I have are adjustable on both rebound and compression, but not differentially. The adjustment only effect the slow speed damping. High speed damping is fixed.
Before the lockdown it had been my intention to take the car out, with the tool tray removed, and try to adjust the dampers to the best results going over the same speed hump multiple times.