I'm currently running at about 250-260rwkw with a nice smooth power curve so nothing really comes on too hard too fast, and the car does mostly street driving. I'm really happy with them because of their bang for buck ratio and their cold grip which is where I mostly use them. If I was taking it to the track then I wouldn't be using them, because as you say, they go off after a few hot laps and need to cool down.
They do smoke nicely at deca though
Using the basketball court for a motorkhana circuit instead of the megamini, tyres do not like it very much...
Also, need rear camber arms