Perhaps the PL system which is used almost exclusively to maintain the temperature of the tyres is not a good idea.
It should just be used to attack in order to go faster (by damaging tires a lot and consuming more fuel) or to drive calmly (to save tires and fuel) to do longer relays. Maintaining the right temperature of the tyres shouldn't be our main problem...!
In iGP we cannot attack for 1 or 2 whole laps without overheating the tires. We can only attack on a few turns and then release the accelerator... In reality, when a driver attacks, it's over several laps... and after that he doesn't have to drive like a snail to cool his tires...