I've got a problem and need some advice...

I am currently running the Ground Control coilovers with the Koni Yellow adjustable shocks...my problem is that with the stereo setup I have in the trunk the rear end keeps bottoming out (the shock mount keeps hitting the rubber stopper causing a loud clunk). I have the Koni's set at their hardest setting and it still happens. Does anyone here run the same setup? Have you ever had this problem and if so did you overcome it and how?

Any and all suggestions/help is appreciated!

Sly