When I hit a speed bump, the front remains stiff like I want, but the rear sorta flexes through the whole leaf pack. I want the rear to be STIFF as hell. Think it's the cushy BDS shocks that came with my lift. Thinking about getting Trailmaster SSV shocks if that will help. Think I could put a 4" shock on my 3" lifted XJ and expect it to ride stiffer?