I think changing that airflow will also yield similar results. After over 20k on OEM Triumph Roadster screen and the typical buffeting, I switched to a Memphis Fats scree. I found nirvana by cutting out driving lamp holes, but with a little more gap over the tops of those lights than the Triumph screen. I pulled the Fats shield down very close to the top of the headlight. I think the air flowing under the lamps and alongside the tank versus up and over keeps the helmet zone free of turbulence. Additionally, my 17" Fats screen is just under my eyes, which is slightly taller than the Roadster screen.
After 24k, my Roadster screen was just starting to show some marks. But most of the scratches was from me constantly taking it on/off the last season.
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I found the answer. The key is to block the airflow going below the headlight and up over the gas tank. By making custom lowers (extending accross the bottom of the headlight) for the Memphis Shades lowers mount and joining them to the bottom of the windshield all airflow is stopped: all turbulance, all vibration, all wind-noise.
