I hope your dealer will be understanding and help resolve this vibration issue. I guess it'll be tricky as it's not something that can be easily measured, just make a comparison to other bikes as you've already done.
Assuming the main bearings are good, my guess is the cause of the vibration is the crank. Ideally it would be great to drop in a new crank and see the difference.
Good luck and let us know how you get on.
All the best, Dave.
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