[EdZ]

One of the snares, Swaying refers to the head, not the hips, correct?

So as long as the head/feet tripod is fairly steady , the feet firmly planted on the ground, and the head ideally stationary, or its movement minimized but still centered between the feet, one can slide the hips all they want , even on the backswing?

Not sliding the hips in the takeaway has been a recipe for my head moving to the right and not returning them between my feet.

Another thing. Wobble in I-L, refers to the head and its associated tripd with the feet, and not the hips, correct?

Wobble refers to any part of the machine that is moving off plane, out of sequence, or with no benefit to the application of the line of compression (out of balance force).

Think of an unbalanced tire. It effects the entire driving experience.

A steady center is certainly a very critical part of eliminating wobble and of creating efficient force, no wasted motion. Many people have 'wobble' in their grips, which is an important area to look to. The Flying Wedges alignments are a key way to ensure your motion does not have wobble.