At rest the front m/c should have a longer adjusted pushrod than the rear. When braking the front pushrod travel further than the rear. I had a similar issue with my pedalbox until I adjusted the pushrods and now the bite is much better as the fronts are getting more pressure to them now.
There is some techie balance bar setup detail on the Wilwood site here http://www.wilwood.com/TechTip/TechPedalTip.aspx (see halfway down the page) you may find it useful as it helped me when I was researching the pedal box setup.