Hello, i know this post has years... however, i would like to share with you what i made in my screen.
I cut a small hole and with a little bit heat i bend a little the screen allowing to some air go thru avoiding the vacum behind the screen...

It works perfectly, i can ride 180Kph without wind turbulence. I'm very tall and have no problems.
My original screen is a Givi.

You can see some pictures in this link:
http://www.clubextportugal.com/t7635...n-aerodinamico
(it's a portuguese forum for XT users.)
After the cutting, i put it some vynil over it so the finish would be nice.