Update: I had the dealership mechanic pull off all the weights, knock the tires off the rims, inspect everything, line up the yellow dots with the valvestems, and road-force balance them.
Perfect. I had to go to the VA building in Philly and spent an hour between 55 and 80 mph (keeping up with the flow of traffic). Everything was smooth and I am very happy. I am sure that the road-force was the fix.
Sadly, it seems like not only did my mechanic never even hear about the yellow dots or the red dots, but neither did any of the 5 other mechanics that were there. My son-in-law is a mechanic at another dealership and he said the same thing. I just feel that if the yellow dots reduce the amount of weights, then why aren't they doing that?
Honestly, the red dots (harmonic balance point) are still a mystery as nobody has been able to answer my original question about them; if the "4" on the back lip of the wheel is "the" spot to line up or is there another spot? I saw the dot on my parents' steel wheel, but have nothing to go on for aluminum.
Either way, thanks for the input.