[lnfletcher]

I agree with D Bill.
I had this same problem and struggled with it for years. Mine was so bad the wheel would shimmy approximately 1/2 to 3/4 inch back and forth violently. Replaced bearings, ball joints, tighted everything way over what it should have been. I even adjusted toe in, and caster with little improvements. Each place I went to said they aligned and balanced the tires perfectly. I even swapped the tires from another car that I have with the same size tire without change. I even looked up a shop with a Hunter Road Force machine and told him that I thought it was the wheel because I had swapped the tires without success. After he tested my wheels and tires, he told me it wasn't the wheels and that I needed new tires as they were out of date, so I bought 2 new tires. No change!
I happened to be at a local Firestone dealer getting a trailer tire put on and mentioned it to the Manager and he said he would really spend some time on it. I brought my car in and left it with him for the day and he found one of the wheels runout out of specs. He worked the tire around on the wheel and minimized the effect. It is 95% better which I assume can't be fully fixed without another wheel. It's not bad enough now for me to spend the money on a wheel.
It just took the right person with the time to do it right! (He also had a Hunter Road Force machine)