Do what silentassasin says, also when you re-tighten the axle pivot bolt you can adjust the amount of play in the axles thus reducing movement which = noise. I like to tighten mine just to the poit were it moves freely, no more. I also put mini limb savers on the top and bottom of my pin guard.

If the sight was quieter on your old bow, that can only suggest that your new bow has more vibration/buzz after the shot. With the new bow did you also go with lighter arrows?