Thanks! The yawing towards the end of the flight is due to my script over-correcting and not being able to get out of it, so more work needs to be done, but it seems that in most flights, despite the swinging back and forth, it gets on target. I might even preserve the bug as a "feature" and call it an evasive maneuver, lol. I may just in the end put in an inline stabilizer, since with one it flies significantly better, but I've been trying to control flight with just aerodynamic surfaces.