My ideal nock point is at 3/4" and I shoot 3 under. You must experiment with brace height and/or nock point placement if you want to quiet things down a bit.
I had a Beeler hybrid that was noisy at first because I had a string that was too short, causing a way too high brace height. I put the correct length string on it and, voila, that bow became the quietest bow I ever owned. Never, ever had to add silencers on it at all and I could hardly hear it. I have to use silencers on my Predator though, but I use trimmed down wool silencers and it's worth the minimal speed loss.