[rpeters549]

I have the same tire, though monted reverse direction, and do not have a hint of vibration. I run mine right around 40. I have standard weights balancing mine. maybe jack up the front end a bit and double check the condition of your steering head bearings? You might also check the rear tire as a slight vibration transferred to the frame might be felt at the grips.
Probably not much help, but hope all works out well.