Took my new Phantom2 V+ v.3 out for my 3rd flight with video and realized later that the horizon was behaving badly, that is the gimbal wasn't keeping level as the craft rolled. I checked DJI Forum's help files and saw that I should calibrate the gimbal with the Phantom2 3.8 desktop software. I did an IMU calibration, don't think it was the advanced one... The unsmooth operation of the gimbal is both with and w/o power when I'm testing it by hand. It seems to 'catch' on a gentle roll then recover. Here's a screen shot of the Gimbal config. How best to configure it? All settings are at zero. It starts to remain level as I tilt it, but seems to 'catch' then keeps moving. Same thing on the opposite roll. ---> FPV Mode is/was NOT checked, not sure why it is in this screen shot. Thanks for any help.