Absolutely right about the hip turn, Bill. That's
a classic move that has only been deemphasized
recently. The Tiger slo-mo shows "the move"
very clearly. If you recall, that leading the swing
with a hip turn while letting the arms and shoulders
follow was referred to by pros and teachers alike
for years as "the move."
Still, I don't analyze the hips and the upper body
as separate entities.

Taking a tip from pro baseball players, today's pros
joke about, "giving it the onion." If you have heard this,
it likens the upper body to an onion -- the ribs and
associated bones wrapped in muscle layers like an onion.
"Giving it the onion" is pouring on the power of the
upper body.

Before I ever heard that, I had invented my own metaphor,
not so colorful or amusing. I lkened the upper body to
an electrical wire, wrapped with insulation. The
twisting and untwisting of the insulation
caused to body mass to build up and release power.

Incidentally, I wouldn't sell yourself or the amateur
players short. If you did nothing but play golf, played on
only the best courses with 3 or better players, you'd be
surprised at how your scores would come down.