Hi, if anyone can help, I'v bought a set of Bilstein b12 suspension kit, consist Bilstien b8 dampers and eibach sportline springs, when travelling at high speed, it feels that the car is bouncing to much at the rear, it also feels that the shocks is not recovering back enough to ride over bumps, and that I'm only driving on my springs, there's rumours that the back stop need to be cut down to position the shock. Any help would be appreciated