Twinman,
You hit the nail right on the head. When I modified the rudder, I made it taller than the vertical stabilizer, I also extended the portion above the vertical stabilizer ahead of the hinge line. (similar to my Funtana 40). I thought more rudder surface would be a good thing, if a little is good then a lot must be better... ha ha ha.
I cut the top section off, bringing it back to the same height as the vertical stabilizer. Opposite banking issue solved. It really won't bank the plane at all, but it will force the plane to yaw and I can turn that way if needed.
Wow! you really know your stuff
Thanks again,
Tim