I like riding naked bikes, but also like riding a fully faired bike. The electric windshield on the Honda ST moves over a 7" sweep adjustable with a button on the left switch. It is the cats meow for wind management. Right now I am running a stock shield that has had 5 1/2" cut off it run in the lowest position, because I like the wind. Were I to roll out to the freeway I would raise it until the wind was manageable. There are times when I will be rolling Long, and raise or lower it 1/2" to get it in the sweet spot. That's how critical wind management is.
The only way to have a quiet still air pocket is to have a shield tall enough that you can look through it.
My personal ground speed point above which I like some wind protection is a sustained 70 mph or above, however except on a trip that involves freeway travel, I am rarely traveling at that speed on the CB, hence I rarely have a shield on mine. Below a sustained 70, I have no use for a shield of any kind. Any fairing or shield that is the wrong height will cause noise and turbulence if it directs the wind into onto your helmet/ face shield.
Want to see where the wind is going on your shield tape a couple 8" pieces of yard to the upper edge and watch them dance when you ride
Tough proposition managing wind.
https://youtube.com/watch?v=r166Lbygbc4
https://youtube.com/watch?v=G7eSiIOQ02g