The first and most important thing to do when trying to silence a bow is to make sure your axle to axle length and brace height are in factory spec. If the axle to axle is too long and/or brace height too low, it means your string/cables have done too much creeping, are too loose and flappy and need to be readjusted.
A bow is never as quiet as it should be when the string/cables are not under the proper amount of tension.
Adjust your bow's tiller. I'm not saying just measure tiller to be equal on each end of the riser. That's a basic starting point. I'm talking 'dynamic' tiller, how the limbs work when actually shooting the bow. Your grip changes how the limbs relate to each other because the grip (center of pressure) is not in the center of the riser. If one limb is coming back to brace earlier than the other, then it causes unnecessary shock and vibration.
Make the limbs work with the same force at the same time and it'll make the bow quieter.
After that, make sure the bow is tuned to the best of your ability, with special emphasis on cam timing/synchronization. With the heavier arrows, of course.
Next step is to go through all your accessories, the way BGFisher described.
THEN, after you've got all the mechanical aspects of your bow sorted out and adjusted, you can start thinking about adding extra rubber doodads and stuff.
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