Have you ever thought about how your mind works when you shoot a shotgun? "Aiming," versus pointing, "swing through" or some other style, foot position, one eye or two? No matter your preference, your head needs to "see" the shotgun muzzle, right? Not overtly, but subconciously.
Here's a video that might help explain it. Maybe. You decide, and see if there's something there to help. Made possible by HiVizSights.com.