Drew, some reckon that with the weight of our car we should be more towards 35 psi, I normally run around 35 psi but experiemented with 31 hot on tuesday. My tyres look fine and wear is good and even, with a fine ripple over the entire surface. did you check any temps on the day?
do you have any suspenison components rubbing?
damage during mounting i suppose is the only other thing I can think of.
either way mate, sorry to see your day ended like this, you were putting out some impressive times.