windscreen causing oscillation?

[davidsargee_imp]

I'm using a National Cycle Deflector, the ride is better with it than without. The wind buffeting is lighter with the screen than without it, and the bike handles the same, except for strong blasts of wind from the front. I no longer feel like a human parachute at freeway speeds or higher.

I prefer the looks of a naked bike, but in my case, the function of the screen has made it worth keeping on the bike for longer jaunts down the freeway.