Adjust the brace height for the quietest string noise and least hand shock. You may have to make a small compromise there, but it wont be much of one. Do this with no string silencers of any kind on the bow. Then add your string silencers and check again to see if you are still at the minimum for noise and hand shock. When you finish your final tweakings here and if you did the other part right it wont be more than a few turns of the string, you will be at the correct brace height for your bow. The brace height that the manufacturer recommends is only a recommended stsarting point, and a good place to start, but it isn't necvessarily the end of your search for the correct brace height.