Deuce + Windshield = Buffeting
I have a Heritage and experience the same problem with buffeting. I live in East TN and it seems to be worse when the air is heavy in summer. I have just about convinced myself that I am going to get the wind deflectors for the front forks.
Here are some pics of the windscreenI have

With my ride I'm just looking over the top of the Shield unless I purposfully scrunch down behind it; I'm 5' 8". Without the shield I get bad buffeting above 65 and unbearable buffeting above 75. With the shield I can cruise all day long at 70. Much of the problem with my ride is directly attributable to the helmit itself though.
What bothers me more than the buffeting is the lift. Once again the windshield does wonders to take care of the problem. Without the shield my helmet wants to fly me right out of the seat at anything above 80; the dam strap will nearly cut my throat. With the shield on helmet lift goes away completely, at least up to 100, which is the fastest I recall having run it with the shield on.
Overall I've finally come to decided that the shield will stay on the bike pretty much all the time. Most of the time I prefer the look of my Deuce without it but I like the ride so much better with it on. It does take a littlebit of getting used to though.
but I also don't ride much above 55mph either, I will only use the windshield when it's colder out.
I went out yesterday and it was a perfect day to ride, no windshield and a nice breeze![8D]
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Brief history is that I've never used a windshield before, but the FatBoyI recently purchased came with a detachable model. The stock windshield was too high (always looking through it), so I purchased a Cee Bailey 2" under replacement that mounted to the stock hardware. It's a perfect height now, as I can look over it now, but if needed I can scrunch down and look through it when needed.
I don't wear a helmet, so I don't get "helmet buffeting", but the problem I had at speed was wind flowing under the windshield and then up from both sides of the gas tank.I have 3 different height windshields right now, a HD 22", HD 20", and the Cee Bailey 18". They all allow the straight on air to flow over my head, so that isn't the problem, it's the air comingup from the sides of thetank.
This 'upflow' of wind was bad enough at speed that it would almost pull my t-shirt over my head, and liftthe glasses off my face. To me it was worse than the 'straight on' wind you get from running no windshield, and I didn't want add wind deflectors andadditional hardware to the front of the FatBoy.
Anyway, on the tripa couple days I made an amazing discovery (at leastto me) LoL... I noticed by riding in my normal position my legs/thighs were positioned a couple of inches from the sides of the gas tank, leaving a 'clear shot' for the wind toflow up the sides of the tank and slap me in the chest and face. By doing no more than moving my legs in closeragainst the tank on each side, I found that this blocked the upward air flow A BUNCH.. The difference was remarkable.
I don't know, something you might try, but it sure made a 100% difference in the buffeting to me...
Maybe I'll keep my windshield after all.

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