I also had the windows up because windows down was even worse of course.
The tissue test is an easy one to do, to unambigously check your ability to have a phone conversation with the top down. Sometimes that phone conversation problem could be due to non-wind conditions. But if you've ever...
20 years ago I bought an ASC/Oris Windstop for my 1998 SVT convertible. It was great. With that, I could put a tissue on the front passenger seat, drive on I-5 / I-90 with the top down and that tissue wouldn't move.
This is perhaps a later version of it (mine didn't have the verticle screen in...