We've tried to reproduce this issue on four different PCs but we never had any car spinning.I've just tried the mod for a quick race at Brands Hatch, 93% difficulty, green track, 18 AI: a couple of AI always spin in the middle of the grip, causing the second half of the group to basically lose any chance to compete for the race.
If you have some time, please have a look at what it giving them problems.
Is anyone else facing the same problem?
Could you please try to run a steam validation and try this again?
Does it happen only with our car?
Anyway, let's speak about this in private, it will be easier to check if it's a problem on your end or if we can do anything about it.
Thanks