check how much of the string is in contact with the limb of the bow at brace, if there is any contact the bow will be noisy , r\\d bows are very efficient at the the transfer of energy and should be quiet if not, could be limb mass or design , I have found a skinny string D-97 ,8 stran for 50#, will help in the transfer of energy of a noisy bow, a bow that transfers the energy most efficiently will be quiet. The stored energy that is not used by the arrow is returned to the limbs, creating the noise. Curt