Blackhawk,
I don't know how much brace contributes, but I certainly discovered with this 64" bow that I have a lot more string against my chest at anchor than I'm used to.
And I found out the hard way that this one does NOT like any brace below 9", which is recommended max.
My string settled a bit, and brace dropped to 8 3/4 without me noticing, and suddenly arra' flight was all crappy...
After trying to figure out what had happened, I looked at the brace, twisted it back up, and suddenly was back to shooting darts again...
My buddy thought I was being weird, until I had him shoot it in both conditions, and now he's thoroughly convinced (and we both draw a bit over 30", depending on the bow...)
Take Care,
Marc