To minimize or move engine vibrations to a different rpm range, try this:
Put a Jack under the engine.
Loosen up the engine mounts (4 bolts).
Use the Jack to move the engine up, down, back or front. (The radial play in the engine mounts are just a few tenth of a mm.)
Lubricate the nuts, and re torque to 44Nm rear and 44Nm front.
When I got the idea to try this I started by moving the engine in the highest
position. I noticed reduced vibrations below 4000 rpm and increased above.
I then tried the lowest position and got the best result, a minor increase below 3500 rpm compared to the highest position but smoothest overall.
With lubrication of the nuts there is a greater clamping force, so the torque value is not wasted by friction at the nuts.
I also made small adjustments to the handlebar by moving it sideways to the right 1mm, and moving the clutch and brake lever holders from being tight to the switch controls to approx. 5mm space.
I now have a much smoother bike, with a clear left mirror at legal speeds
The vibrations will also change:
When the heat from the engine is transferred to the frame.
When fuel is consumed from full to empty.
Baggage weight and/or location.
And so on.