And the answer is....
The shocks were bad, and the rear shocks were too long.
I put in the KYBs Saturday and took it for a drive on my test road yesterday. The rear shocks were indeed too long, but as 300k pointed out, that doesn't lift the back end of the vehicle. However, all the shocks were shot. The front (Ranchos) you can compress easily and they never, ever rebound; the rear (Gas-matic) will take 30 seconds to rebound. The rear shocks are a good 2-3" longer than the KYBs that I put in -- I conclude that someone thought they were putting in a lift kit. This means that the shackle angle may be a little off, too.
On the test drive yesterday, the ride was improved, barely. It still rides rough, but not quite so rough as before
