yup, I know.

But I would think that if you increase the ATA length and decreased brace height, then the draw cycle would begin at a point closer to his grip.

If you decrease the string length, wouldn't it decrease the axle to axle, increase brace and put more strain on the limbs? The draw cycle would then start at a point that is actually further from the grip. And he would have to anchor at apoint further back from where he is now.