Road force balance is a balance done on a special machine.

http://www.gsp9700.com/

It has an arm which rests on the tread and can determine whether the tire is in specs as far as being out of round. If out off round, no amount of balancing will make the tire run without vibration.

 

I think those balancing machines only balance to 60MPH. You might ask them to replace the front two or rotate them to the back and see if the problem moves to the back.

 

When I worked at the tire shop we always used to balance the tires with the safety shield up so you could see how the tire tracked. We would look for side to side wobble in the rim and tire tread and up and down variations as well. I suspect you have one of these problems. Bad front shocks will add to these problems as well. Many new tires are out of round right from the factory so this is pretty normal.

 

Well, they road forced balanced 1 or 2, they claimed 2 anyway before they said the machine broke on them.
I've yet to hit the highway but will tomorrow.
Tires say 65 psi max cold, they have 40 in them now.