I have had similar experiences on different vehicles. Almost always it has been the tires. Tires can have defects that cause out of roundness and density differences that feel exactly like and unbalanced wheel. I usually buy cheap tires and I have the problem often. The only solution is to swap out the tire that is rough. Shaving, balancing, rebalancing, nothing will fix a tire that is not uniform in density or composition. Never had a rough tire with Michelin.

Mark