Body bounce and vibration are two different phenomena. Body bounce is a result of too little rebound damping for the road contour and speed, but even the OE "comfort shocks" on most MBs provide excellent rebound control unless the roads are exeptionally poor and you drive VERY fast. Base MB suspensions feature relatively soft springs, lots of suspension travel, and excellent damping. In general, there are no more competent road cars.

Vibration is usually shaking of the steering wheel or some other component at fairly high frequency. It can be caused by various tire and suspension problems. If you have installed lower profile tires than OE they can often cause annoying vibrations, even if the tires have no radial force variation and the suspension is in excellent working order, because the suspension was engineered for the transmissibility and damping characteristics of the OE tires. Lower profile tires are much stiffer and have less damping, so they can tranmit a lot more high frequency road input into the chassis and cabin.

Duke