I use the Wunderlich Vario on my mostly highway rides and it works very well. But I completely agree with you that it bounces around too much on off road stuff. I can ride with the Wunderlich at 80 mph with the helmet visor open.
Originally Posted by Lager Meister
The V-Stream attaches to the headlight mounts as you described. After trying the Wunderlich Vario (with the added deflector), the Cee Bailey's Enhanced 18" and 20" and now the V-Stream tall screen, I can say without a doubt that the V-Stream provides the cleanest airflow of the three.
I have the Aeroflow short offroad screen on order for my off road excursions. All of the large touring screens bounce around too much for my liking when things get rough. YMMV