today we had nice weather so I could finally test my downgraded P3A (AC at 1.4.10 with RC at 1.4.30)
I calibrated the compass, I haven't done it for a long time
flight was ok, I didn't have the issue you had described
when I rotated AC to specific direction and pushed elevator stick, bird flew exactly to that direction, no "drifting" at all
thanks to Litchi I also finally broke that 500 m height barrier, AC flew up to 636 m, then I lost connection completely (distance was only 530 m and so angle was larger than 45° - not optimal conditions for signal at all)
next time I will try these high-altitude flights with larger distance