Great info Ryan! Thanks for taking the time to do this, and posting the results. Your experimentation, and insight has helped myself, and I'm sure numerous others. Keep up the great work. And thanks for your contributions to this great site.
As far as the placement of the "puff balls" go, I personally have had the best results following the heterodyning theory. I place the top silencer at the 1/4 mark, and the bottom at the 1/3 mark. I've tried other combinations of placement and types of silencers, but this has become my go to set up.
If the bow only has a slight twang to the string, I've found the wool string scallops from Two Tracks, in the same heterodyning positions, to be sufficient. But if the bow has a little more thump or buzz to it, then Terry's wool puff balls are the way to go! I'm very happy with these products.
I'll agree that you'll notice a much bigger difference on a working tip curve, than a static. I've got a super shrew scout, that is a great shooting bow, but without the bow hush and hush puppies, I wouldn't take it to the deer woods. Now it's quieter than some of my hybrid longbows!
Thanks again, and please keep us posted on your results.