After I power up I let NazaM GPS initialize untill it records position. When I first take off on GPS my F450 wants to tip over. When I get it up in the air it drifts to right requiring constant left aileron imput. I have to land record position again by flipping the home lock and course lock switch several times and after that it holds position and flies fine. If I change battery I have to start over again (fly, land and record position) then it will be ok. I have Turned the GPS module to the right about 15 degrees and I have completed both the IMU and GPS Compass calibration succsessfully. I think that I have the quad balanced. What can I do to fix this problem? Any suggestions?