What is the purpose of jacking the front or back up while doing IMU calibration? i thought you was supposed to keep the unit on a flat level surface, than do the calibration.
Just a thought and an observation, but when you power the quad up make sure your on a level surface. Mine seems to drift if started up on an un-even surface.
also i tried to do the same thing with the IMU calibration, turned out it was a duff Naza.