I noticed this too when I started riding my V20 years ago. The road vibrations were such that I felt like my eyes couldn't focus. But at the time, I had more pressing concerns, like, "how do you even ride this thing?" I was so focused on learning the whole MBB thing and trying not to die, that it wasn't until after I made it through most of the learning curve that I noticed that I had also acclimated to the head rest and road vibrations along the way. The vibrations were still there; they just didn't bother me anymore. I'm not necessarily telling you, "Stick with it. It'll get better." But that was my experience. (I also stuff a block of two-inch thick craft foam inside the head rest sock. That probably helps).
Robert's suggestion of trying the suspension adjustable head rest is also good.