I think it's largely that different bikes seem to like different things with the VO2's.
Marshy I belive is 25 or 26 on the Aprilia whereas I have ended up at 27-28 on the BMW.
Dave Moss wrote a good review on tuning tyre pressures and carcas temp, specifically on the VO2's and their wear...
http://feelthetrack.com/testing-prog...02-slick-test/
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