I just got a ST1100 don't know why I didn't get one 20 years ago, but I have the same problem that a lot have with screens the first ride I had was 7 hours and I had to ride with the visor open because of the wind noise in the helmet the screen is standard and I'm 5' 10" or 5' 11", I have read a lot about the size of screens and everybody seems to have different ideas on whats needed.
I found this deflector that may fit the bill as it looks to be very adjustable and I was wondering if anybody has had any thing to do with them, "MRA X-Creen Touring Aufsatz" any help on which way to go would very helpful.