Track tires worst nightmare is heat cycles, not so much tread wear. I've had tires with no tread left, work better then tires with plenty of tread, but had been heat cycled to death. The street usually doesn't put a heat cycle on the tires, so you're probably totally fine.
That melting rubber look is related to the heat cycle. As you get better, you're tires will look more melted and the faster you go, the more you need to be concerned about these heat cycles.
That melting rubber look is related to the heat cycle. As you get better, you're tires will look more melted and the faster you go, the more you need to be concerned about these heat cycles.