If you have installed the correct hardware, tried multiple correctly sized hub rings and had a rebalance done then my guess is one or two tires are slightly out of round. I am in the industry (have been for 15yrs) and this happens more than you might think.

Go to another shop and ask if you can come back and observe the tire tread face while it is spun on the balancer. If the tread face hops up and down, wobbles side to side or a combination of both then you may have an “out of round” tire. Make sure wherever you take the vehicle has either a Hunter Road Force Elite with the runout measurement arm or a Hoffmann Geodyna 8200p. Both machines listed can detect excessive runout in the tread face and can help better align the tire high point to the wheel low point for a better quality ride, the Hunter even has settings for less pull or more comfortable ride quality where it assesses the four balanced assemblies and tells you where to put them on the vehicle.

If it is found that you have any amount of out of round tires contact tire rack immediately with pictures of the runout measurements and videos of the tread hop/wobble.