I am also 6'-3" and have a Madstad as well. I got the 13", I usually have it adjusted all the way up and at a 60 degree angle. I downloaded a clinometer app for my phone to measure the angle. In the summer in SC I adjust it down unless it rains. I keep the 60 degree angle and that works for me. it brings the wind up and over with no buffeting. Light rain at highway speeds mostly goes over me, but heavy rain will still make it through.