[EdZ]

I'd say that the donut/swing sock is indeed beneficial for learning the feel of the swingers "uncock THEN roll" - the throw out action - what may 'feel' like a very 'wide' release (full sweep) as you start to 'get it', can then be brought back to a better position as you learn 'downward' - down plane force.

Feeling that throw out, and then learning to 'delay' it via the right shoulder/hip - 'magic move' - getting that right elbow in front of the right hip. The power angle pro is a great training aid to get the idea here.