Bubba,

If I can interpret what Greg is saying, he may be saying that the draw weight near the beginning of the draw cycle may be harder on your shoulder than a higher draw weight later in the draw cycle.

I.e., take 3 bows, a 50 with speed cams, a 60 with medium cams, and a 70 with old, round cams. Conceivably these three bows could all launch an arrow with the same KE. It is possible that the round cam bow would be easier on your shoulder than the 50 as pulling it would require strength primarily where your shoulder was the strongest.