I went to the woolie whispers or whatever they are called and they were a marked improvement over the beaver, which I ended up putting on my Don Brown longbow. When I went to heavier arrows, that helped to absorb a lot of the excess noise making vibrations.
Cat whiskers cut in half and placing them at the 1/3 and 1/4 sections of the string will really help to silence it. However, if you're shooting an ultra lite arrow, that will drive the noise level up.
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Make em sharp and shoot em straight, or leave em home.
I've known of them liking anywhere from 7.5" to 8.5" for a brace height--think I have my Hunter I at around 8". You might try a small set of silencers at the 1/3 and 1/4 points. Tinker with the silencer placement--sometimes an inch up or down can make a world of difference. Also, what kind of arrow flight are you getting? If the arrow spine is off, it can increase bow noise. Not sure what a 2018 weighs, but a light arrow will also increase bow noise.
Chad
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When I first got my H2, I was having trouble getting it as quiet as I like also. With a BH of 8.25, cat whiskers at the 1/3 points and wool yarn serving where the string makes contact with the limb, my bow is whisper quiet. It has been my experience with my CM's (falcon special, hunter 2, falcon, atilla and firbird) that they seem to be quite sensitive to string slap. Take care of that, and i think you will be well satisfied, I know I am. I have been told by more than a few people how quiet my bows are. Good luck.