I've had noise problems with Hoyts. Try and tighten the cam bolts. They look tight but can be loose. The wood grip does loosen. Make sure the limb bolt pocket screws are tight. The plastic washer isn't much and is made to sit only one way. If you back the screws out slightly more than slightly the washers will spin out of place. I replaced mine with brass ones.

If you hold the bow by the grip and pound on the top limb/cam enough to make things vibrate you'll be able to pin point the noise if it is something loose. A cable guard slide can chatter. Strings could be out of wack. If they are the bow will be fighting against it self.

The spring in my rest (GKF infinity drop) vibrated after every shot. I finally fixed it by opening it and pouring hot wax in. It's very quiet and smooth now.