I agree that this sounds more like a training issue and not an equipment (P30) issue. The reason you shoot the USP better it is a bit more "forgiving" to shoot and doesn't highlight the fundamental problems that you are having like the P30 does. Don't get discouraged on the P30 or shooting in general. You sound like a newer shooter which is fine. Even the greatest shooters were new shooters at some point. I would echo those that encouraged you to get some training. The sooner the better. The longer you practice the bad habits that you may have the longer it will take to unlearn them and get on the right path. Practice doesn't make perfect. Perfect practice makes perfect. Good luck.