I post rarely, but.. AI strength variation value is strange in AC. It does not work like it is told to work. At variation=5% there is always a car (one car) that pulls away from others, with gap reaching ~1 min at the end of the race (~15 laps). Also at 4 %, not as much, but anyway. And it happened in different mods, included with game and in also downloaded mods as well.