what is the correct way to set up the biscuit and arrow knock. should i find dead center of the string by measuring the string and cutting it in half then setting up the whisker biscuit ? i always thought you had to have the knocking point a little high but my local pro shop says if your shooting a caliper release to have your knocking point dead center. also on my bow there are screw in type burger button holes on the rest i think?. in setting my bow up should my arrows and rest be set up so the arrow is level with these holes or should i go by dead center of my string and not worry about the holes lining up.