As Pete mentioned the first thing that comes to mind after worn steering components is worn suspension components. Bushings could be worn and sloppy, which if you are installing new springs should be replaced anyway.
I think you are on the right track with having someone turn the wheel while you are under the jeep looking at ever connection, I did this on my 79 F150 and found track bar bushing in the front was worn out, but looked fine when the truck was just sitting there.
For the suspension, you can also try turning the wheel and looking at your leaf spring bushing, you shouldn't see any movement between the bushing and the frame of the bushing and the spring. The other thing I would try is having someone rock the jeep back and forth to find any worn bushings. And as Pete said look at both the front and the rear. While you are at it too, look at your springs for cracks, some one prior to you may have tried seeing how far the jeep could flyà
I assume when you were looking at your steering you were also looking at your steering shaft and if you have a rag joint, you inspected that? On my Ford the rag joint is worn to hell and it does make the truck wonder, just because there is play between my input to the steering box (the steering wheel), and what the box is sending to the wheels or the wheels are feeding back to the box.
Hope this helps, and I know how you feel having a vehicle that others donÆt like to drive, and in one respect its nice, I hardly ever get people who want to drive my truck. <img src="/forums/images/graemlins/cheers.gif" alt="" />
Sean