I'm 6'1" and I use an 11 inch shield.
On nice days, where I want a lot of wind, I generally keep it all the way down and all the way back unless I'm running highway speeds or if I just don't want any wind at all. Then, I'll generally roll it forward about 1/4 of the way. Doesn't take much to get the wind to be just right.
If it's raining, I roll it all the way forward.
If it's raining hard, I roll it all the way forward and pull it all the way up.
The only instruction I read was the one where they said not to adjust it while riding. So the first thing I did was take a ride and adjust it while I was riding. I adjust it on the fly every day....not dead yet.
I can't imagine setting it and forgetting it. Conditions change too much for that.
2013 Cross Country (Houston/Katy Texas)
People think I am too patronizing. (That means I treat them as if they're stupid.)