Check your shocks. One or both could be knackered. I just replaced mine with Rutherford AVOS due to one of the old ones (Koni) failing. The result was some sloppiness in the rear and bottoming out too often(!) BIG improvement with the AVOs. Currently set on softest setting. Fronts set on 4clicks.
I have a Panhard rod already so cannot compare with and without, but the old shocks were the cause of my problem.
I also have a rollbar so that and Panhard have firmed up he rear too.
