Cabrio wind noise reduction successes?

I've had my Mondial Cab for four years now, and when I first got it the wind noise coming from the connection point at the top of the windshield was really bad. I drove west while the sun was setting and could see daylight, so I got some strips of foam and pulled up the rubber gasket seal at the top of the windshield and put the foam strip under it. This raised the seal and helped alot, but not completely. Then I took a hammer and with the top attached, I gently tapped the metal bar that is under the fabric (just above the seal) in the places where there were still gaps. This removed the gap noise completely.

Now the wind noise that remains comes from the high frequency vibration of the fabric just above the rear view mirror, starting at about 70 mph.

Is there some sort of deflector/spoiler that I can attach to, say, the windhield wipers that will break up the laminar flow over the fabric?

I am interested in any feedback/successes/products. Thank you

 

Was this a stupid question?

 

Do you know of some kind of deflector that clips on to the wiper blade? Something to break up the airflow before it hits the leading edge of the fabric?