It's simple moments. Put the centre of gravity of the system into the centre of the gimbal to achieve static equilibrium. However, when there is acceleration (walking, slowing down) there will be a force acting on the system hence the swaying. Compensate that with drop time adjustment or use your free hand. Your hours of calibration is for only for one system (a particular weight configuration.) To protect your time investments, use different colored markers/stickers to mark different balanced position for different weight configurations (different accessories) so that you can quickly regain balance in the field. In an emergency just hold the stabiliser by the centre column instead of the gimbal handle, that will eliminate all unwanted swaying. Make sure the centre of gravity of the changed system is inside the palm of your grip. Then grab your right wrist with your left hand to reduce unwanted panning.
