Spun rod bearings are caused by insufficient oil, which is usually due to insufficient pressure at a period.
Thanderhill Raceway turn 2 Clock Wise direction is a rod bearing eater. It often happens on high G turns where the engine is at very high rpm's and the oil is pulled away from the pump. Sticky Hoosiers don't help this issue. I remember reading that track S54's have an upgraded oil pump and modified baffles. More pump pressure will also let you run a lighter weight oil which will also make more power.
Sorry to hear about your bearings but everyone should not be worried unless they track the car heavily or run low oil.
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