Mistake. (Just stay with the SIMS Crossbow style leeches, 2 sets if you don't care about losing a couple fps, but IMO the SIMS stuff is far superior to those fuse silencers.)
Make sure you have everything that can clank , scrape, bang or vibrate tightened and loctited and moleskin everything of contact. ESPECIALLY the rest launcher.

Avoid plastic accessories.

Make sure it's TUNED. A well tuned bow is "always" quieter, and make sure your string and cables are in good shape.

The heavier arrow will help ALOT.

An STS type device like a MeanV CSS can remove any excess vibration that is causing noise, but it has the potential to add a new "different" noise with a slight pop. I think the good outweighs the bad on this one and makes my Guardian which was already the quietest bow I've shot jaw droppingly quiet and vibration free. [:-]I hear it on some bows but not on others.......I don't hear ANYTHING on my Guardian with it.