Hello Oldphart,
Thank for the video, impressive!
I made a similar expierience, but tried the other way round:
With the original wind shield I have massive turbulences around the head - quite annoying.
I added a wind shield extension and in the nearly upright position of it it is much better now.
What I do not know so far is, how the original wind shield can cope with the additional weight, forces and vibrations of the added shield...
Hitchcock also offers a lower and a higher version as far as I know.
The turbulence and wind noise seem to depend on many factors:
The stature and size of the rider and the helmet, not to forget Motorcycle, windshield and speed...
Regards
Toni