Not a special design. Its just a rebranded Samick Sage more or less. Not a particularly loud bow or particularly quiet bow. The BH you are using is adequate, much higher you'll start to lose some performance IMO. For that bow, some ways to deaden it down are to throw a layer of adhesive backed moleskin or soft side velcro or thin rubber in the limb pockets, also make sure the limb bolts are good and snug (without breaking anything of course). Im not a big fan of velcro in the grooves, you might try wrapping wool around the string ends (the bundle part that contacts the limbs).
The Sage style bows do better with cat whiskers IMO than lighter weight puffs, unless your puffs are fairly dense like Navajo wool etc. Even at its "loudest" I wouldn't call that bow a real loud bow, a lot of it can be perceived by the shooter. Keep tweaking it.