Under pressure...
Having watched rubber disappear at an alarming rate on previous track days, particularly and obviously from the shoulders of my SO2's, on Saturday, I tried them at 35 fronts and 36 rears cold. Whilst I didn't check them hot, from previous days, this should have translated to around 40 ish hot. Wear seemed much better from the shoulders and more even across the tyres although I guess had it been wet, 40 would have been too much.
Normal advice is to lower pressures for track days for 'normal' cars but as the GT-R is such a fat lardy beast, upping pressures seems to be the way to go if you want to be able to drive home on a legal set of rubber.
I've never tried this but I did read somewhere about running a chalk line across your tyres before going out and then seeing what part of the tyres scrub this off and adjusting the pressures accordingly...?
Peter.