your right hand goes numb because your holding on to tight & your set up is wrong, it has nothing to do with vibrations. it happens on all bikes.
try adjusting your levers down to make them more comfortable and then look into getting a wrist support for the throttle and clutch side. it locks on the grips and then your wrist helps your hands hold on. it takes almost all pressure off the muscles that help you hold/ twist the throttle. its sort of a cheater. good for long trips but not for ripping around.
research done please feel free to donate to my research :)