Damping Profile ??? 95 E320

Hi
Heres a question for the geeks!
What should the force/ extension curve look like for the rear damping system of a 95 wagon? Accroding to my knowledge, it should simply be an exponential graph.
In practical terms, it should mean the the back end of the vehicle, when loaded by hand and then released, should simply return to its rest position without any oscillations.
The reason for my inquisition is that my wagon, bounces twice before coming to rest (harmonicly damped oscillation). The car is Starmarked, yet the dealer, who is normally great with me tells me its okay.
Subjectively, the car bounces around and feels like a Lincoln/ Mercury!
I have also owned a 300Te which was unlike this E320 (only 44K miles) and had no such problems until one of the accumulators in the sel-leveling suspension system began to fail- car began to bounce like a bucking bronco.
Any ideas on this ????
Thanks
farrukh