I don't know is this applies to sportcars but in sportbikes, when you use stiff carcass-soft compound tires, you lower tire pressures a couple of PSI's so that they heat up faster (cold tires on a car is OK but in a sportbike it can take a whole other meaning
) and also achieve the higher operation temperature that they need to grip under colder weather.
I'm using
DOT racing tires on my sportbike, so its a problem to get them to their high operating temperature on the street, forget about riding in wet, so pressures are ussually lowered, specially on winter days on these types. Since they have a very had carcass they can withstand lower pressures than normal tires for which factory pressures are designed for, just like R-compound Pilot Cups on a car.