1998 S500 suspension

[OdinsThrone]

I have a 98 S500 and it rides terrible. When I go over a bump the car makes a loud bang, cd skips the whole 9,**** rattles! I have replaced the folowing:

Accumulators,rear upper shock mounts,front shocks,front sway bar bushings, the arm ends up front forgot the name, valve is working fine in the back to raise the suspension,theres no leaks in shocks, plenty of fluid in resivor? the car is on factory rims 16" with stock size tires. Also local mechanic said control arm bushings are in decent/good shape. What can it be? This is getting worse. engine mounts are good ,and also transmission mounts. Could it be subframe bushings? This car is very heavy so something that takes a lot of stress? Any info is helpfull! Thanks....