Jeff - I can see you are one of those inquiring minds type of guy. Try this: take one of your super stiff arrows and remove the fletching. Shoot it (field point only - no broadhead) at your target at 20 yards. The overly stiff arrow should hit to the left of where a fletched shaft hits,and will likely be angling into the target tip left. This is the tendency the fletching has to overcome to get straight flight. If your arrow was too soft, you would get the same issue only the bare shaft would be angling to the right. Wouldn't it be more efficient if the bare shaft was hitting right where the fletched ones hit?