Hello
Here are my experiments with screens :
I started with the Dart screen. Useless for me, I'm 6'4.
I then got a Touratech screen, better but still too small. The airflow which came right into my throat with the Dart, now came into my eyes, which is unconfortable, and made my helmet shake sideways.
I added a deflector, which made it a little better.
Here is a picture of the deflector on the bigger screen I had then custom made, similar to the Touratech but bigger. The Touratech has a little lip at the top, so you cant add a deflector.
The deflector helps, and is ajustable, but not very large.
I ended selling all these, and got a GIVI Airflow.
Now I can drive in the rain without being wet ! I still can see over the top of the screen. Perfect for me, and no big drag on the handlebars.
Very happy with it !