@crashman, I think we're mostly agreed that your coach is giving you some old school advice.
BUT
when I take myself back 20+ years when I might tell a skier the same things, I was usually saying those particular things because I didn't think that skier's "pull" (lean) was hard enough. When you are skiing your hardest pass, are you getting later and later? If not, ignore this post (your coach just doesn't like your modern, open-shouldered style). If you are getting later and later, I wouldn't take his old school advice, but I might take to heart that he's trying to get you leaning through the wakes more aggressively in a strong position, and to stop skiing straight towards the ball. As the amazing video above demonstrates, you don't need to close your shoulders to do this, but you do need to get your hips up and lean more away from the boat.
I know I'm going to sound old school here but while Rossi's advice on where to look seems right for a seasoned shortline skier, I can't help but wonder if looking more across the lake might do more good than harm for a fifteen-off'r. When we look where we want to go, we tend to work (lean) only hard enough to ski where we're looking. If you find you're getting later and later at 31/32 mph, it might help to aim 30'+ in front of the ball (ie., look more across the lake, not at the ball).
My 2¢, open to criticism. To be honest, I'm still trying to learn to not crank my head and look directly across the lake.