If you are exhibiting vibration after Road-Force balancing, then something is off somewhere. There are many that say that match mounting the tire to the wheel is not important with Road-Force balancing, but it is still, especially with large diameter and wide wheels/tires.
Do you have spacers on the car? If so, make sure the mounting surface is absolutely clean, and that anti-seize paste was not applied ANYWHERE except for the hub protrusion and not on the back face of the spacer or rotor.
Also, please make sure your wheels are torqued properly, under or over torqued wheel bolts can cause vibration as well.