Hey snowplow
My only bows are 66" Blackwidow longbows, and after a fair bit of testing I've been running 4 small wool puffs pretty much from when I'd worked out what worked best for me.
I tried the Blackwidow supplied string "Spiders", then cats whiskers, wool puffs, and many combinations and distances apart of each. Everything worked at silencing the string, but I stumbled on an outstanding combination.
Shooting from inside my shearing shed out to the target outside lets me hear the bow noise the best, and the quietest by far has been the 4 small puffs positioned about 8" & 12" from the bottom limb tip, and 8" & 14" from the top limb tip.
This, coupled with a 11-12 GPI wooden arrow, makes all three bows really quiet, just a dull muffled "Thump". And this is inside the shed, when shot outside it's even quieter still.
Hope this helps.
Best
Lex