Anuj, I personally have never tried these and I can see that balance is definitely an issue with these. You mentioned taking a narrow grip versus a wider one because of your shoulders. Are you gripping the bar shoulder width or a little past?
It seems on a couple of the reps that as you are coming down your upper body is tilting forward a little bit causing the bar to come forward and on your way up you have to overcompensate and rock back. Maybe a slightly wider stance would help?
Good luck on getting the form down and thanks for posting up the video. Now I may have to give them a shot.
