Assuming you have ruled out the mechanical possibilities you need to start being aware of every aspect of the shot as you make it. Is your grip changing? It doesn't take much torque to move the shot 2 " one way or the other at 30 yards. Is your string making contact with your face (i.e. Nose or cheek) at full draw? If so, make sure you are not changing the amount of pressure after x number of shots. How about the sight level? Do you use one?
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