I think I better explain this in better detail. The first thing you do is get the proper module for our draw length. Then you draw the bow till the cable wraps to the flat part of the module (full draw). At this position you set the draw stop. This should give you the full 80% letoff. If you do desire less letoff you can move the draw stop toward the - side of the slot, maybe 1/4" would reduce it to 65%.
The only thing you need to watch for is that if the draw stop is set to the full + side and you have a module for a shorter draw length you could actually draw the bow and rotate the cam too much, in which case you could rotate the cable off the module track and lock the bow up at full draw.
Adjusting the draw stop is not as difficult as it may sound. It's somewhat easier to do with two people. One draws and anchors and the other can play with the draw stop.
With the draw stop set correctly for 80% you'll get a very solid wall. If you draw the bow and it feels a little spongy then most likely it's set just a little too long.
Give it a try and if you have any problems come on back and we'll walk you through it.
AND lastly, welcome to the Tech Forums.
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Martin/Rytera Staff Shooter
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PADI AOW Diver