My experience with driving in gusty sidewind condition is that when I start leaning forward on the seat the handling gets much better.
I made my doors on the scooter dismountable in case of heavy sidewinds, but I never used that option. In a way you get used to some more bike movement with a fairing. Possible in my case the enlarged front wheel fairing is giving negative effects too. I am preparing a fixed front so maybe when that is ready I can find that out.
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