I will also throw in my two worthless cents as well. I have found from my now 40 plus years of riding that the taller the windshield the more buffetting you will get! True, you will get less rain in your face, but you also have more drag and resistance on your bike with a taller winshield! I have a Corbin fairing and I ride with a 8 inch smoked Harley Ultra Classic windshield that I can see over the top of and I get absolutely no wind buffetting at all at virtually any speed.
In the rain, the rain tends to go up and over my head, of course until I have to either slow down or stop, then, like everyone else I get drenched! When I rode Harley's, which I still do, I ride a windshield which I can see over the top of and receive little or no wind effects.
Native One