IF you are having a horizon tilt when you Yaw the craft it is because the IMU is not in the right position on the side of the camera holder. So you can do 6 point calibrations all day and still you will have the tilt on the horizon.Follow these steps to fix this problem. 1. If you have tried adjusting parameters on the GUI reinstall a new profile. 2. Perform a gyro and accelerometer calibration. 3. Look at the IMU and verify that is in a near perfect vertical position (when holding the gimbal straight and level) If not fold a piece of paper or something to wedge the IMU board to a vertical position. 4. Perform a 6 point calibration. And test fly and verify If the horizon is straight and level while you yaw. 5. Now use some hot glue and carefully apply 2 small daps on top and rear side of the IMU board to secure that position allow to cool and harden (careful not to put too much) 6 perform another 6 point calibration, And verify level horizon. 7. Voila!!! You are done.