You may have a spine problem. Too stiff or not enough. If cutting your arrows shorter helps, your arrows were not stiff enough. If you need to stiffen more, get a lighter point/ BH. Work in reverse if you need less spine. One thing to remember, the difference in length between your field point and BH, can throw off your FOC. Therefore your FPs may never hit the same as your BHs. I just sight in with BHs.