What do your bare shafts like best? Sometimes, arrow setup can determine the sweet spot.
Usually, I try to find where the bow shoots the smoothest and quietest, and tune my arrows to that brace. Sometimes, after the fact, I find that I may have to add or remove a few twists to get everything to feel and sound like I want. It's strictly a feel thing for me.
As you adjust brace height, you may also have to adjust your nock point.
I've found, generally speaking, that the lower the brace, the more string noise you get, and the higher the brace, the more ringing noise you get from your limbs (with a d/r or hybrid longbow). But each design is different. Go by what feels best when you shoot, and try a few different string/silencer combinations. It's amazing how a few small changes can alter the way a bow shoots/feels.