My right shoulder was droopy. It is much better now but it will get lazy at times. It is as much a strength issue as it is a neuromuscular issue. You must constantly keep it at the correct height consciously until it learns to unconsciously stay there. Meanwhile supplementing with strengthening of the upper trapezius and levator will help as well. Best of luck. In my case strengthening the neck and shoulder elevators and upward rotators has helped me tremendously.