On the highway, with the speedo corrected by TuneBoy, I'm doing 70 mph at 3K rpm (50 mph at 2K rpm). Images in the rear-views are blurry. More throttle, more speed = more blur. At about 100 mph, don't even try to distinguish what you are seeing in the rear-views cause it ain't possible. The vibration is there & always has been on my Rocket at the higher speeds, or should I say the higher RRRRR's. I do believe my issue is related to the "engine" speed, not the speed of travel. Others will tell you their Rocket is smooth at any speed. Maybe a recall item on mine, not sure but it is there (the vibration that is).
FWIW. See ya.