Throwing rocks? Interesting perspective… I will help anyway … the line on the riser shelf means nothing… just a starting point possibly… and is sign that bow shops are so stupid they have to have the manufacturer tell them where to start… check your rest timing as well cause QAD break all the time.. I have replaced 4-5 of them from improper installation breaking them. In tuning you have to determine if what happened to the arrow is an action or reaction to something happening on the bow. A failing test can give you a stiff indication on paper tuning because as the shafts flexes, to rides on one side of the prongs and causes a reaction false positive.