Another one of your very thorough and very professional videos.
Incidentally, riding in the rain is interesting.The first time I rode in (medium) rain for a couple of hours, I did a lot of experimenting with my left hand, moving it around and about the windshield, checking the air and water movement. It turns out that -- just like the dry air flow -- the rain/air coming up from the bottom joins up with the rain/air going over the top, and then up and over (depending on the angle of the shield)... just like the diagram at Madstad's site.
Good instructional video; I am extremely happy with my madstad setup. Really glad it came on my used bike; a little strange at first but I now like the look and it does a fantastic job, with no buffeting.