I'm sorry, not to go off course, but what would changing the upper control arms have to do with the wearing of the inside of your tires? Most of the aftermarket arms add caster to your alignment. Caster is not a tire wearing angle. It usually takes a lot of camber to wear an edge of a tire. Improper toe is the main culprit of early tire death. What specs are all these alignment shops using? Is there perhaps a problem with another part causing your trouble?