I have a Symphony that continues rotating 60 - 90 degrees after releasing controls on a snap or spin. I have to pop opposite rudder to get it to stop. I also have an Integral that stops instantly when the controls are released. One person suggested shortening the stab as a solution. The stab span is about the same on both planes. If that is a solution, can someone explain why? Is there another solution? The wing LE might not be as sharp as on some planes, but I assume that affects entry and not exit. Due to paint problems with the Symphony, the tail ended up heavy -- would that contribute?

Ken