Centramatic Wheel Balancers

Well drove it around town and it felt better at under 50 mph but when I got up to highway speed at 55 mph to 68 mph still shaking and vibration. Brought it back this morning to them and manager called me back and said that all 4 Dyna trac 245/70r/19.5 load H tires were defective?? DW ...whose is already not too happy bout this wheels and tire investment :E drove me down to the shop. Spoke with the manager and he explained to me the situation. I asked him how can this be and he says they deal with this all the time. Asked him if Road force balance would help and he says think of it this way you can balance a square but it is still a square... This shop has been in business for 30 years and they have a huge stock of 19.5 tires, Michelins, Bridgestone's..etc.... and have major contracts with Verizon and power company trucks with 19.5s. Well now I am totally confused.. Do I call the manufacturer? Do I take it to another commercial shop. Already taken truck to 4 other commercial tire shops since I mounted these tires and all of them has different opinions. By the way had the Vision wheels checked and are fine. Help!!