So as it stands, all (official) tracks have their low-medium-heavy-saturated-whatever realroad presets done by letting AI cars drive on it for X amount of time.
That results in the grip being concentrated to a very narrow trajectory, resulting in the cars behaviour being very peaky on/off that...
Let me get this out of the way, I've made about 20 or-so AIWs & only once before have I used the pit extension option... trying to create a pit extension was the last AIW I worked on because of this same issue that forced me to recreate the AIW ~30 times, then I just quit rFactor 2 all-together...