This is an AMG model which means that it was modified for performance. Now of course that will sacrifice the ride of the car, but if you wanted a luxury cruiser you should have gone with an older CL or stuck with the CLK430.
I would suggest you just leave it alone, because any mods that you do to it to make the ride better will just cause more headache and lower the resale value.
1985 500SEL 124k miles
2001 Honda Civic EX