I think you are still sitting back too far, and it is hard to tell, but if you are having shoulder rotation issues it probably stems from A) having to lean too much because your butt is too far back and B) your hands are not far enough apart.

Depending on how tall you are, a snatch grip (which allows for the greatest shoulder mobility) should have your hands spaced wide enough that the bar hits you at just below the tops of your hip bones. OH squatting with a grip closer than this limits the shoulder and thus impacts form considerably.

Either way, you should be squatting down between your heels, body upright as possible.