MPU-9250 instead of MPU-9255?

[seandepagnier]

Not sure the problem with alpha, but since v1.0.0 the calibration in pypilot was improved.

I think you have the good sensor. You can scope the accel output, and see that each sensor gives output in the range of +- 1. If it goes from -0.9 to 1.1 or something like this, then it needs calibration,