kikaider, u sure ur tyre pressures are correct? i have never heard anyone run on such high tyre pressures even on road tyres in track...
i believe in ur case, it's tyre failure due to over-inflation...
i set my tyres to 25 when cold on road tyres, and 22 when cold on slicks/semislicks
p/s i'm just an occasional trackday entrant, no race experience. talk cock king.