It could be multiple factors like maybe tires size? But like I said you take the same car and bring it to another track and it will not happen. I've raced extensively F1 Classic Gen3 and out of the 4 races we did in our championship it happens only at Jacarepagua' only on the pit straight and at every lap. If I drive down the straight a bit more towards the center it does not occur. It is clearly track related. Nothing to do the the sudden side pull from FFB.