I just noticed this at roadbikerider.com
Scroll down to the Solution for Persistent Brake Squeal question. As a "proud" owner of a set of these brakes I will be installing boosters soon. After having tried every conceivable solution I figured the problem was something along these lines, but this obvious solution never occurred to me. DOH!
Of course, after I do how will my riding buddies know I am coming from blocks away? This can be handy if you are running a little late; they hear you coming and wait for you.