I have also installed the Bilstein HD shocks on my '01. I have an Xcab, but i do not have the same thing(wobble 3-4 times) as you are describing. Another thing that i have done is adjust my torsion bars to make them a little bit tighter ( increase height). I adjusted the front so that the top of the wheel well in the rear sits about 1.5" higher than in the front.
Other than that, the suspension is stock with no lift kits or blocks.
Also, i do tend to jump over a local set of train tracks like Bo or Luke Duke (no speed limits broken) and love the landings with the bilsteins
