It is a whichery kinda thing. I have two Mohawks. With my 30 inchdraw, they seem to prefer a 6 3/4 inch brace height. Most folks shoot 7 to 7 1/4 as confermed by Vince. My Whip like 7 on the nuts, again 30 inch draw and with all bows, the arrows are around 10 grains per pound of draw. They are quieter with lighter arrows, but i hate to stress the bow too much with the long draw, short brace and light arrow.
I am a quiet freak. If my bows are even a tad loud I will not toerate it. So after they are tuned and shooting well, I check themwith a decible meter, must be well under 40 decibles at 10 yards. then if my son can hear the release at 15 yards, I tune more. If he can not, I am home!
Every one is a bit different I would wager.
Bob.