Thanks for your thoughts Shootin4par,

To posting the left leg from thigh down, I found the amount of hips slide is out of control, sometimes sway sometimes not, the left foot seems not well attach to the ground. If from ground up, left foot can grasp the ground firmly because it is the first thing I have to do on shifting weight in my mind. The hips move and stop automatically at above the left foot, no sway. Am I right?