It's the bow when it torques or twists when you shoot. Excessive shock may mean the limbs are unbalenced or out of tune. If the bow unstrings it self while shooting. If the string does not track centerline of the bow. If the tips of the strung bow are not centered. When the nock point is off. Usually, if it is the equiptment, it is usually the arrow. It will be too stiff or too weak. The wrong arrow and a bad nock point will give really bad flight no matter how carefully you shoot. Bill