Thanks Derek! Actually, it does need some trimming as it flies tip down when upright and tip up when inverted (which is evident in the photo of the inverted pass.) The picture of it overhead may have been in a gust of wind, so can't be used for diagnosis.
Here is the embarrassing part - I am a miserably slow builder and this plane is about three generations behind. I started building it in the "tweak the flaps" era. So it doesn't have an adjustable trim tab, so now I have to figure out how to neatly retro-fit one. I have retro-fitted a Rabe rudder on it since it's predecessor (my Silver Lancer number 2) was significantly improved when a Rabe rudder was added to it.
It also doesn't turn as sharp as its predecessor, so I'm going to try a handle with wider line spacing. If that doesn't work, I'll add some tail weight.
Scott