While it is common to stiffen the shock rebound when your bike kicks straight up over bumps, many times it is caused by compression that is too stiff. The key here is try one change at a time to determine what is the cause. The same is true when your shock kicks to the side and the cause can be too stiff rebound or too stiff compression. If your bike is bouncing on big bumps stiffen your rebound and soften it if is bouncing on small bumps.
