BradeyI think Scooterbob was saying that there is a more than likely chance that something is out of spec on the Bike Chassis, that is giving you the issues.Mine, and most of the C5's here handle safely alone the recommended speeds range. Bearing in mind it is a light bike and depending on the size and shape of the operator, handling at higher speeds will vary from rider to rider. These Bikes are not marketed and sold as high speed machines, and have a maximum top end of around 85 to 90 I do not think you would ever see an RE as an 80 MPH Canyon runner without serious modification.Get it back to the dealer and explain your issue, and request that he test ride it. Something is out of whack and needs to be fixed. The bike as designed is very stable at 65 MPH.
Here is an interesting link describing motorcycle chassis oscillation. Note that EVERY motorcycle has a resonant chassic frequency!http://www.vf750fd.com/blurbs/vibmode.html