Well the Klockwerks 14" screen (only 10" of screen visible once mounted) hits me the wind right on the upper half of my helmet.
So I drilled 3 additional holes a good inch lower and mounted the screen an inch higher. Now it's a little better, the wind stream hits the upper part of my helmet only. I can ride with open visor up to about 50-60mph now.
Will leave it on for now and off tomorrow morning early for a +1000mi mountain trip thru Switzerland with destination Italian Dolomites.