I just had a similar situation with my MPP flying against the wind at around 150ft. UAV forecast indicated winds of 15 mph at that altitude but it wasn't making any progress in normal P-mode, and whilst it did eventually get back in sport mode, it was by no means easy. I'll try re-calibrating the IMU and see if it makes any difference (I haven't done any calibrations since delivery) but, as mentioned above, I was wondering if anyone had fitted the standard props to their MPP and see if that made a difference?