Pete, I was thinking the proportioning valve might give you an adjustment point to begin exercising it at different pressures to reduce the front bias if it was evident when you were testing. However, I don't believe the diagonal wheel process of controlling that the system uses is an issue. The ABS should be doing permutations in very quick time: much faster than human reaction times (e.g. pressure on left front and right rear then pressure on right front and left rear........) in the same corner or slide. So if it is balanced to correct for weight bias, you would expect it to function as designed. The real tough problem is you don't have a similar car that has been setup with the Subie components unless some racers have done it on one of these exotics with similar weight distribution. WEK.