oldbob,
I just went back through all your posts in this thread trying to find out which side got the pop-can trim tab. I probably just missed it. But I did see where you taped it to one side. Do me a favor and do another experiment.

Move that trim tab to the other wing. Needless to say, you'll have to deflect it in the opposite direction. And let us know what happens. Probably nothing, but it'll be interesting to try. I sorta wish one of my biplanes had shown that bad character just to get to play with fixing it.

Thanks for sharing your story, btw.