Explain exactly why you aren't fixing your posture? Posture isn't there for looks. It's functional. Working on hip and leg action without fixing your posture first is like working on your fastball while sitting on an office chair. Am I totally off-base here? It seems like the lowest hanging fruit to me in terms of helping you achieve the motions you are trying to achieve, which will help your body out. I fixed my posture (among other things) and went from struggling to hit a 7-iron 135 with several visits to the spine doctor to being able to hit it 200 yards with very little stress on anything other than the golf shaft. I can't understate how important it is. Getting posture right should be a key step between achieving keys #1 and #2.