According to SSL I was the first to adopt their dual rate solution to the rear before front. Admit I already had the factory 5 link rear though using coil overs. The improvement was noticed before I left Dan's drive. It did then highlight the lack of compliance at the front though so fitted their RS kit later.
You can't get away from the inherent lack of travel front or rear but the dual rate does give you an inch or so cushioned ride over less bumpy surfaces.
