I created a package MOD for the GTE class of 30 cars across all the manufacturers with their default attributes as I have made no changes / modifications to the cars or tracks themselves. More often than not they seem to all qualify in bunches so that they run in groups of Corvettes, Porsches, Astons, etc.. I have set the AI strength to 105%, Aggression to 50% and Limiter to 10%. I did have a similar package with 20 vehicles, with a similar result. The AI seem to race ok, not slowing or crashing about and their pace doesn't seem to be affected it's just gets old battling with a couple of manufacturers, the one your driving and the group immediately ahead or behind.