Success
At 90% gain in the TX, the heading hold works very well, and does not change throughout the flight the way the gyro did on the CPP2.
I made several flights of a minute or so, at about 6-18" altitude only, as that small battery runs down so quickly that I don't want to get caught too high by the ESC. At 18", she appears to be out of ground effect and gets very easy to hold over one spot.