clk320 Handling Inprovements?

[S600VXR]

Having decided to keep the CLK (W208 model) now for a while I want to make it a little less wobbly, its a work hack so nothing to serious but whats the best things to change? I've ordered a set of slightly lower springs, just fitted new alloys, 18x8/10 (f/r) but it just seems to move about if pushed at all as if the bushes are soft. Nothing that bad but compared to a well setup E46 sport its a bit off the mark. Any experiance or ideas out there.