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Just a thought...there's a difference between wind buffeting and actual motorcycle vibration. If you are sure that the bike itself is shaking, and it always has done, and the windshield makes it worse, then check that the steering head bearings are properly adjusted. Get someone who knows what they are doing to check them for you - and the wheel bearings, too. Basically, if you can get the bike on a lift or on blocks so that its front end is clear of the ground, and you can feel actual movement if you grab the front wheel and push and pull the whole assembly backwards and forwards, then that's your problem. Fitting a windshield will provide a larger reciprocating mass on the other side of the fulcrum, thus making the problem worse. To buy a brand new bike with incorrectly adjusted bearings is not at all unknown...