Run your hand over the right front tire to feel if there is any irregularity. Move the VW ahead a few feet and feel again. I suspect that you might have tread separation.
If the circumference is nice and smooth, it might be the results of the fix-a-flat inside the tire. Get the wheel and tire to a tire shop; have them remove the tire; clean out the remains of the fix-a-flat; find and fix the leak; remount the tire; and rebalance. That should fix the imbalance condition.