Is it on purpose that the cars are not matching in terms of performance?
Especially the Lamborghini you have chosen is way, way way out of proportion to the other cars.
Even a Porsche 935 K3 on full boost posts slower record lap times on RSR than the Lambo not to speak about the other cars in this field :-(
Currently this is a 4 class field:
1) Huracan
2) F488
3) McLaren, Porsche GT3 RS and 911 R
4) 911 Turbo + Nissan GTR
Kicking the Nissan and Huracan and replacing the F488 with the F458 would make for a more close field in terms of performance. I tried for some time how possibly other cars fit into this performance wise and adding the Ruf RT12 would be a nice addition - it performs just a bit better than the GT3 RS and 911 R but not as quick as the F488.
Read the intro in the first post