I agree on the stabilizer suggestion. Provided you choose an effective one it should make some difference with the noise level.

However, the reason any bow generates a specific noise level is because of the amount of energy left over after the arrow is released from the bow. To quote an old friend from here..."heavier arrows will absorb more energy and therefore will create a quieter shot." The problem with this scenario is that everyone wants to shoot lighter arrows to get the most speed and the flattest trajectory. To balance these two issues out consider a compromise. Look for arrows that weigh at least 6 and preferrably 7 grains per pound of draw weight. That should help reduce your noise level, increase your accuracy and still get you a flat enough trajectory for ranges that most bowhunting shots are taken at.

Hope this helps.