2007 Sport Cub, 300 hrs.: Has anyone experienced the vibrations described as follows.

In the air or on the ground, as the RPM is increased from approx. 1,600 RPM to approx. 2,200 RPM, or the reverse, a noticeable vibration is felt - strongest at approx. 1,900 rpm. Have tried switching to one mag. Have tried varying mixture. None of this altered the vibration.

Prop Sensenich Wood with about 200 hrs. Was removed from plane and stored for 4 years, then reinstalled 2 yrs ago. Prior owner dynamically balanced it about 1-1/2 years ago. Vibration status prior to balancing, not known.

Has anyone had this problem or even heard of it.

Thanks for your patience. LBlack