China, Spain, Monaco, Canada, Austria, Silverstone, Hockeheim, Hungary, Spa, Monza, Singapore, Russia, Brazil: 105
Bahrain, Suzuka, Mexico, USA, Abu Dhabi: 104
Baku, Paul Ricard: 103
Majority of tracks I'm at 105 and then a few at 104 where I'm a little weaker. Baku and Paul Ricard are definitely the toughest tracks with the AI being very strong, especially sector 3 at Paul Ricard.
Also find the AI balanced between qualifying and race. I run short qualifying and always drive out and drive back to pits to avoid any simulated lap times from the AI. That gives it more balance between quali and the race in my opinion as the AI don't end up with crazy fast laps in quali on the sim and then they could appear slower in the race.