I would have a hard time blaming a harsh ride on Rancho 9000 (white) shocks. I ran them on my 85 extended cab with stock length Alcan rear springs and the ride was reasonable though I rarely had them a off of the lowest setting. I currentmy am running Rancho 9000 RSX (silver) shocks on my 89 4Runner with 6 inch over stock Alcan springs and I run them maxed out all the time. I would actually turn them up more if I could.
The Bilsteins did ride nice on the street on my 4Runner, but didn't have enough control in Moab. I constantly bottomed them out when slowly dropping down ledges.