Handlebar Vibration Issues

I have a 2006 Suzuki M50 which has vibrated since day one of purchase. Now that I purchased a windshield, speeds over 60 are intolerable as windshield shakes so badly as to distract me almost totally from operating motorcycle.
The dealer thinks it is in my head. What can I do while bike is still under warranty?
Without windshield I can cruise at 75 with just tingling in my hands.

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