Joe, here is my advice. Pull your shoulders back, and it will take some stretching to get use to it. Get in your set up position and I will be willing to bet that your shoulders actually make a bowl shape. Think of it this way, you want everything pointing down the target line, and with your shoulders being such a vital component it only makes sense. I'm not saying to pinch your shoulder blades back until you feel pain, but pull them back until your back straightens out...