Buffeting has alot to do with what is on your head as well as your shield. It's terrible if I have a helmet on and non-existant without one. Seems to me that if I have a shield that allows me to look just over the top of it, as it's supposed to be, the air hits the top of the helmet. So that means a taller shield would do the trick but then I am looking thru it and that's not acceptable for many safety reasons. Try different helmets if you must wear one or go naked.
You have that option... ala Worthlessburger.... But I hope no harm comes to ANYone who chooses to not wear a helmet! Here in Virginia we have to have a DOT certified (as a minimum) helmet.
I see the wisdom in your words...and felt it today. Cool morning so I used the full face helmet I just bought. Very little buffetting! But it had its disadvantages too... clostriphobic feeling, Limited visibility, limited outside noise warnings (although I will classify this as.... more engine noise coming from below cancelling out outside noise. I was cruising up the 4 lane at about 65 enjoying the smooth airflow and was startled by the tri-axle dumptruck that blew by me at 70!)
My 1/2 helmet is a better feeling for awareness, ride enjoyment, and precieved cool

But sux for the high speed buffet.
I guess I just thought thaT a higher/wider windscreen would solve most of the problem.
Sometimes the obvious...is not sooooo obvious...!