Hi! (new member here; first post)
Instead of a deflector I chose to swap the screen with a double bubble. Improves wind deflection and aerodynamics for me going anything quicker than 60mph. I'm roughly 5‘9, and living in Autobahn-country am traveling at speed often.
The swap is done within minutes (ensure to have a plastic tool for removing the panel though).
The screen is a UK made Powerbronze Airflow in dark tint. (£65)