I have a Clearview, which measures 16" from the fairing center screw to the top of the windshield. I am thinking of replacing it with a Windvest shield. 1) They recommend 8" (huh?) for my height 5'7", but the Clearview measurements instructions are from the top of the shield to the turn signal indicators. 2) Which is correct? and 3) Which is a better shield... the Clearview or the Windvest?