G'day John Albers, welcome to the forum
As for a screen for your ST1100...
I used a Laminar Lip on my ST1100 (while I owned it) and found it to be a great improvement to the standard screen for me (I'm 6'4 tall).
The Laminar Lip redirects air flow over top of windscreen to reduce buffeting and noise.
As the air flows between the windshield and the LIP, the air becomes pressurized and redirected vertically.
The air flowing through the LIP is pushed up approximately 6-8” above the normal height of the windshield, creating an invisible extension to the height of the windshield.
http://www.laminarlip.com/st1100.php As for my ST1300, like StinkyPete, I use a BikeQuip screen and have found it to be the best after market screen I have ever used
(However, as I haven't used the BikeQuip ST1100 screen, I can't comment on them, only what I have used... the Laminar Lip)Cheers
Shiney