YouTube - myswing280808
here's some footage from my swing a few days ago. before i'd have my left shoulder too high and right shoulder too low through the ball. now the left side is really clearing and the right shoulder working nicely all from the inhibition in my forearms. so, the shoulders may not be the thing to focus on. they might be the result of other things as opposed to a cause of your problems.
from here i have been stronger with my pivot (no fear of hook) and generally hitting it harder and getting better compression than before.
the first shot i hit is 8 iron aimed at a pole to the left of the range but after that they're all 5 irons aimed at the white pole off in the distance, it's the 200 metre marker. might be able to notice that they all start straight at it. i hit 30 balls within about 20-30 ft of that pole. it looked like a bag of chips or short pitches. i don't say that to blow my own trumpet, just to say that there's no left shots and my ideas might be worth working on. in the past i would always have at least 2 or 3 that would miss the green left.
don't mean to hijack this thread, i thought it would work well as an example of a former hooker that's found his way.