"Maurizio
Each race is only used supersoft and soft tires? It is not right! It may be worth it for each race to choose two specific composition of the rubber? Or improve the performance of medium and hard tires? Do something with it!
Right now I think there's nothing that need to be done.
My leagues' races usually start about 23:00 GMT, in other words, when it is night in Europe so the temperatures are lower, so the tyre selection sually is limited to SS and S.
Well, took part in a league (with another user login) where race starts go about 12:00 GMT. Had a race in Bahrain in which the temperature was about 43ºC.
Needless to say, Softs were cooked before the end of the first lap. Mediums almost cooked too, only PL1 was marginally suitable. Hards were the tyres of choice.
In another race (can't remember which; i'll edit this post later if I do), temperature was about 37ºC and mediums were marginally better than hards.
My point is, it's not about the tyre system that is flawed, is about the time of the day and season of the year you're going to race.
Regards : )