i am a pin aimer so i can't have any middle pins up. Is it only on the A2 pinsetters?
If you can't pick up corner pins with middle pins set up, then your problem is focus. You are not keeping focus on you target. When you lose focus on your target you are moving your eyes and your hand will follow your eyes. You really need to practice using the low ball game to improve your focus and spare shooting.
Very well stated. This is an excellent point.