CG,
Is there any chance there is a bit of play in your cable guard rod that is causing a vibration or noise of sorts to begin with? The reason I ask is that I've tried the SIMS CG dampeners on several bows, a few different single cams and a dual cam and I really couldn't tell a difference at all. I was thinking that MAYBE you are getting some extra baseline vibration right at the cable guard that these are directly helping?..........I mean I did everything you did. Shot with them on shot, with them off , moved all over the place and I don't know if I was hearing ANY difference at all and I have pretty good hearing? You know one of those things where you kinda tilt your head to listen and go......."MMMMMmmmm I don't know,I can't tell?"

I know I sure couldn't FEEL anything.
I was imagining they couldn't HURT so I just left them on, but since I've sold the bows that had them on I've not replaced them and have since thought of them as sort of "Gimmicky".
I'm not downplaying them or saying you aren't getting great results........just trying to put a grasp on why they work so much better on that bow?
I guess maybe I'll have to pick up another pair myself and give em' another shot on any new bows I pick up.