Hello again,
I think the problem it´s in the way you take the gimbal handle when you walk forward. Do you notice more walking forward than backward? Think, that when you walk back, you tend to pull from the gimbal with the position hand and when you walk forward, you push with this hand. The problem is to push the gimbal. Try the following. Rotate your body a little more frontal from the sled and with the position hand, try to pull the gimbal and not push, lifting a little your elbow. It isn´t a natural way for walking but it works. Think, that the way you walk is very important too. Yo must try to make soft steps with a foot on the other.
I see that you tried the arm with the tension in the middle of the boom range. Try to loose the springs a little more (about 10 degrees under horizontal bones), lift the arm to the headroom with your position hand, and will work even better for slow steps.
Best
Nacho Minguez
Steadicam Owner/Operator
SPAIN
nachostd@terra.es