Been there, done that. You're overthinking and measuring your targets. And when you do miss with people looking on, you get nervous and continue making the same mistakes. Go out to the range by yourself and work out the problem, but pattern both guns first. Find where they're shooting. And when you get up to the station, look at your setup, foot position, etc. You've made all the shots from all the stations hundreds of times, so it's not a question of learning. Sometimes the brain won't let you do what you know you're capable of. In other words, unless your guns are completely out of whack (which they probably aren't), it's all in your head. Fix it with a good, working practice session.
