Bryan,
What type of nok do you have. On a one-cam bow their is a lot of downword pressure on the arrow at the shot. If you have a nok-point that does not anchor the arrow on the bottom side-say a loop, or whatever, then the string will slowly wear towards the cam, giving a gradually increasing higher point of impact over time. If you shoot 60-70 arrows a day, it might move an inch high every week.

The string should be stretched in about 50-100 shots, usually I set up my bows after 200 shots and might make one minor 1/2 turn after several months-but that's it.

Jeff...U.P. of Michigan.