Put Manually Yaw PID 30, 0.1, 20 , does it work at all, if not experiment with some different values. After you get it holding somehow try auto tuning starting from those values.
But before you do anything, verify that your yaw is well balanced.
Also remove the adaptive PID tuning while tuning, you can activate it later on if you want/need.
Also, be sure that you enter correct number of poles. AUTO function for motor direction works great but can screw up number of poles value. Enter manually number of poles, it is most likely 14.
Ok now i did whole process again. Still same. Yaw is vibrating but its moving freely. Pitch and roll are steady good with the movements. Also the yaw is rotating to either right or left. But not center. I also did the auto settings but no improvements in the movement.
I was holding the whole gimbal just by top grip. Wen i start holding it with the top frame the yaw automatically got straight facing. I think thats may b the fault as everyone is using gimbal stand. Going tonget one today. Lets see.