This is pretty much a case of not being able to have your cake and eat it too. You can continue to tinker with the aerodynamics, hoping to find a balance point between backlash wind/odor and rider protection, or you can pursue heated grips, hand covers, heated riding gear, and so forth. You have to decide what you prefer to tolerate and go from there. There are several approaches you could try, wickerbills on the deflectors or windshield, different deflector/windhield angles, different deflector/windshield sizes holes in the deflectors, Baker Air Wings, custom exhaust extensions, different muffler, and so on. Without a wind tunnel, only experimentaltion will tell the tale. This could be expensive and time consuming. There is no magic bullet short of trading the Spyder in for a Smart car. JMHO