I have a 62" A & H in almost the same weight, and I don't consider it noisy at all-with one puff on each end. Same with a couple of Adcocks that have even less silencing. My brace height is close to recommendations. I've only used very minimal silencers-typically I start with none....add one on each end if necessary, and then start trimming to find the minimum that seems to work. My strings are home-made flemish, either 6 strand ultra-cam or 8-10 strands of 450+.
Some recurves have been very noisy with skinny strings and very little silencing, but I haven't found that true with the hybrid longbows.
Two pair of rubber silencers is an awful lot(guess that's why you're asking!) Does more brace height help? I used to start with minimal brace height and nock height and work my way up. Now, I go the other way. Any chance the combination is causing some arrow slap? Are you using real light arrows? I'm typically shooting about 600 grains with 18% foc.
No offense intended. Owning the kind of bows you're describing, you likely know all this stuff already.