Thanks everyone for all the advice and ideas! There are clearly a number of things I can do, each of which will probably provide incremental improvements. I agree that the first thing will be to try a different hitch. Of all the things I've done so far, going from no w/d to the Andersen was by far the biggest improvement. A hitch that can restore 100% to the front axle may be all it takes to make me happy.
If after that I'm still looking for improvement, stiffer shocks for the truck or timbrens would be a fairly easy and low cost thing to try. Last would probably be the Air Safe. It looks like a beautiful product and one that looks like it's designed to deal with precisely what I'm complaining about. But considering the cost, I'll definitely be trying the other things first!
I'll definitely update this thread after I try a new hitch.
