@DRudd13 The point stands: tallying your laptimes to your teammate's on a quali run still is the best procedure for adjusting the game difficulty.
The AI isn't changing their setups on the fly either. Those were all set by the devs in advance.
During gameplay the AI may not be 100% "there" too. In many instances the game will take control away from the AI (their decision making while driving the car, so to say) either completely or to some degree, hard coding set parameters for their behavior on track as the AI still is fast from perfectly realistic. Like when you and the AI have a shunt on a corner and you notice that their car barely deviates from their path? That kind of stuff.
One of the only sim racing titles that actually manages to have the AI working on the same driving model as the player is ACC, but that's a whole different conversation as they're trying to achieve different things with their AI.
So I'd wager it doesn't help as much as you think it does to know their exact setup. You're not comparing yourself to another human player on a TT leaderboard. The AI will be dealing with the same factors as you sometimes, sometimes it won't - like temperatures won't be fluctuating the same, downforce won't be working the same, acceleration won't be hitting the same, etc.
And again, for setting the game difficulty your best tool still is matching your laptime to your teammate's.