If you're shooting with a partner, have them load a round and make the weapon hot for you while you're not looking. Have them switch between live round and snap cap every so often. You'll never know which one is loaded when you squeeze to fire. When its loaded with a snap cap your flinch will become noticably apparent and you can see how you anticipate the shot breaking. That will seriously help you correct it. Can't remember where I learned that but it really helped me.
If you've got one foot in yesterday, and the other in tomorrow, than you're pissing on today.