Nice one. As a youngster I used to have a saggy left knee (lots of leg drive) and try to spin the hips hard to keep them ahead of the hands to ward off a hook.
The legs and knees just anchor the swing now and have no action (although I personally try to throw a little left knee straightening in but not to fully straight. The hips have an action for some but do they ever actively spin through the shot? Is instant hip acceleration a slide in transition with a delayed hip turn?
If Im doing startdown waggles and hold the right hip back as I bump left and then go a little bit further in Downstroke with my only on my right shoulder the hips turn or are maybe turned.
Perhaps this is just a feel and not a real. Certainly better than spinning out.
See ya.
I'd say you want to slide your hips the amount that allows you to stay on the selected plane. That being said . . . not sure there's any research on this or whatever but imagine you got one of them surgical tubing deals stuck up in a door frame. You can pull that thing LOTS easier if you go forward with your hips and pull down with your arms versus spinning your hips and your shoulders.