I hope this helps take some of the guess work out of AI settings, for those, like me, that are slow enough to be racing the AI below 100% anyway. Now you can take your pace at a specific track and see what AI % to set them to for a similar pace to you. To this end I have spent over 24 game hours allowing the AI to run at various settings on all tracks to produce a lookup table. For those of us that mostly race the AI we want a competitive race (not too easy, not too hard) but also the AI to be doing times that push our skills so we improve.