if you move it to the S its gonna get shorter draw and towards the L is longer draw.if there is to many twists in your string its gonna max out over what the bow says for instance if your bow goes to 70lbs. and there are to many twists in it its gonna come out to 73,72,71.I would check out bowtechs website and download the manual.it tells what the timing mark is on it too.unless those guys ghanged your mod to a 65% let off mod?