I have an 08 Z71 silverado. Experiencing a choppiness or bouncy effect going down the road or even braking over small bumps . Rotors have been turned and dont notice it braking over smooth road. Yes its a truck and I realize Z71 is stiffer but surely something can help. The dealer says the shocks are the softer ones and they have put bigger chassis mounts on which helped after hitting bumps but still this truck can ride smoother. Are the springs too stiff? Do I need diff shocks? Any advice is appreciated!