I do believe the weight of a bike has a lot to do with how it behaves in in conditions of wind. I have ridden 125s 250s,400s, 500s, 550s 650s and 750s and everything up to the 750s seemed easily influenced by winds and or pressure waves off of passing vehicles. With both the GS750 and now the FZ750 I have not noticed that at all.
Also, those bikes with frame mounted fairings don't seem to be as easily affected as those with bar mounted windshields.
In summary, I'd say bar mounted shields would be fine 90% of the time but just be aware of those winds coming on the rear quarter as they could catch it and use it like a sail taking control away from you.
Good luck and let us know what you decide.
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