I put some Cobra Chromes on the 2020 road glide special...they seem fine until I get to 110kpm and up..then I can feel a sort of wobble, and it gets a little worse in long high speed bends. I have checked the tires, no visible defects, everything looks good. The garage where they installed the tires said that they had a hard time balancing them. Could this be causing the wobble, poor balancing? I have tried higher pressure, lower pressure...