I wonder if the little breaking effect could be due to the magnets?
From what I have heard from the guys at the track, the Binary Quad Mag doesn't run as well as even the chameleons.
From my running my Quad Mag runs well. I had a problem of overgearing at first that was really affecting my motor, used to much brushes too fast. I run 767s exclusively, but I did like the 766s in there, they didn't get beaten up as bad as my 767s did. ( I must run them though, I have like 10 pair
I would probably just run purples all around on the motor and the stock brushes. You will be happy with that.