Re: Quieting shooting noise
I don't believe sound dampening devices quiet the bow down much but they do change the sound of the shot and reduce vibration. You are right that the arrow retention spring contributes a lot to a "tinny" sound. Bow Jax makes a dampener just for the spring.
Overall, I like them but more for reducing vibration and hand shock, more than anything else.
I support all hunters, regardless of weapon or technique!