Hello Bernie,
I use B6's a lot for my run n' gun work, and I have one method that seems to work almost every time. You may have already tried this, but it's as simple as about an inch and half strip of transpore directly over the mic. I position the mic head so that it is right at the top of the tape, flush, forcing an airgap for better sound transmission. I usually put a one-loop of cable in the tape also as a precaution. Place this strip in your sweet spot on the backside of the top layer of clothing, and be (usually) contact rustle and breath-pop free. If there is the risk of wind entering the shirt, I'll just cover the entire mic head with the transpore. I'm usually surprised at how much it really doesn't kill the highs on the mic. Good luck! I need it as well...
Alex Altman
Nashville, TN