Ok, I shaved 4 of my 6 tires yesterday with great success. I just ran out of time and will do the other two today.
The decent tires took about an hour each. The rough ones about two hours each.
I believe my setup is very simple and worked well. I took a beat up old sliding compound miter box that my dad had and adapted it. This saw flips both ways so the motor is up high and out of the way. This worked well as I could do one rear tire and flip the saw to do the other. All I really did was take the back off the sliding bars, pull the saw unit out, and slide it in the back. The saw itself is pinned down in the put away position. Then I strapped the base to a tool box for support. Jack up the axle, set the saw, and go.
I figured the slider would come in handy for adjustments but I didn't really use it. It was needed for depth clearance though. To adjust it I just moved the tool box. Light kicks to the box made cutting a little deeper easy to do.
I also followed the round profile of the tire. I didn't just go straight across. With my kicking the back of the box over for depth adjustments this was kind of a natural movement of the unit so that worked well too.
I just set the saw to shave the highest points on one edge of the tire and then kicked the back of the tool box over to cut a little deeper. Once it just barely shaved the lowest points then I pushed the unit in a little further (1/2" or 3/4") and started again.
Just take your time and don't get too agressive with the depth of cut. You don't want the saw to grab the tire and pull itself in or cut a big gouge out of the tire. Nice and easy.
I tilted the saw a little to give myself about a 45° cut on the tire surface and spun the tire into the blade (as opposed to away from the blade). I tried both and into the blade gave me better, smoother, and faster results.
I am very happy with the results of the setup and its simplicity. Besides rubber dust everywhere the saw can be returned to normal service.
I really hopes this helps somebody with the same issues. I know I had two tires that lost atleast 1/4" of tread off the high areas, and maybe more. I still feel like I will need to experiment with balancing fixes but this is a major step in smoothing out the ride.