Been trawling Jag sites and questions have been raised regarding the CATS active dampers. There are accelerometers that firm up the suspension when cornering, braking and accelerating via a solenoid. Other than slow speed and doing one of the above, the solenoid on the strut should be in soft mode when moving. Default is firm and will change to soft once it receives a voltage signal. Maybe the choppy ride is because the damper isn't receiving signal and remains in firm mode?