" (I always sat at the back well away from the props) "
Very wise. However, if anybody felt so inclined, they could, I suppose, work out the correlation of the vibration frequency of the horizontal stab to their meal vibrating across the seat table....that would keep you occupied when, as has been correctly stated, a headwind component was involved .
On a more serious note, we were always led to believe the stab vibration issues came close to negating certification .