RE: Precision Aerobatics Extra 260 problems??
Try installing a small wedge of about four sq in in front of the vertical fin. The fin should resemble the one on a Mustang. A small triangle extending the vertical stab forward. I would provide a picture of the one on my Yak but I don't see a simple way to do that. On the PA extra the wedge has a dramatic effect on the wing rock and makes the plane much solider in a hover.