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