Most have found that increasing rear tire pressure INCREASES oversteer. I personally find 45/45 front/rear works for me. Rrxp683? (Chris) has been very successful using over 50 lbs. in front. I don't know what he uses in the rear.
The increased oversteer with higher rear pressures seems to be a function of reducing rear tire rollover thereby causing less tire grip and increased slip angles. You want the tire to rollover a bit for maximum grip. You must have at least 45 lbs. or so in the front tires or they will rollover too far causing less grip and more tire wear. Remember that there is much more weight on the front tires than on the rear tires. Then you have acceleration forces and the brunt of the braking forces there as well so front tires are the workhorses.
Dave Andrews what are you running and any others?
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