RE: Be patient with the ignorant one.
You will also have to do a little brace height adjusting to find the sweet spot. Some bows are real sensitive to it. You may want to do a little searching to see what range would be and try different lenghts. I usuallystart from the lowerend andincrease brace height by 1/8 inch at a time. A lot of times though you will find that the bow will shoot best toward the upper limit.I don't know thebrace height rangeoffhand for your bows. I'm sure Art P would know or know where to find it (PM him, he is not always in our area, but is usually somewhere here).
Also if you are shooting real light arrows (under 10-12 grains per pound, I'd say 500 grain arrow would be about right) you may be getting a false reading.