Originally Posted by lucid
Interesting. Your experience is completely in line with the conclusion drawn in the Skip Barber book about the grip freshly shaved street tires will provide on the track at different shaved tread depths based on their testing. There is a question around if somewhat softer compound street tires such as the PS2 fall under that category as well, but they probably do. The info SenorFunkyPants was provided by the Michelin rep kind of suggests that they would.
Where is the test that shaves a tire so much that there is not enough tread life left to even finish the session? I don't think that test ends up getting run very often and if so only by a big accident.