Just an FYI. I recently purchases an '08 Norge. Love the bike. The windscreen was at a height, for the way that I sit on the bike, that bugs and rain would come off the top of the screen right at my eyes. The other night I cut some PVC pipe that fit over the top mounting post of the screen mounting rail. I made one for each side about 1/4 inch long each. I placed the spacers over each top mounting post and placed a washer next the same inside diameter to go over the post and outside diameter of the screens rubber grommet. There is maybe and 1/8 inch of the post showing now. I replaced the screen. Used original hardware on the bottom. The two top mounts now have a pvc spacer, then a washer. Next is the screen and original rubber grommets in the holes, the plastic chrome "beauty" washer and now longer screws. This stood the screen up enough, for me, to make a rather large difference in the airflow over me and my wife has noticed a difference behind me also. Not a complete air bubble but out of my eyes and the forehead part of my helmet is not collecting bugs any longer.
Something to try as the cost was just a bit less then a taller windshield...