Here is my review of some of the tracks. Race distance is always 25%+, often 50/100%, the car Im using is a Red Bull and occasionally Ferrari. No assist/legend AI/wheel.
First off I'll say thanks for all the feedback 
Second, I had a sinking feeling that people with wheels might still find issues with this mod given all the advantages a wheel gives you. I drive with a gamepad and assists unfortunately, so I do the best I can with testing. My gamepad gives me about 1/4 of an inch of motion between full brakes and no brakes, same with gas lol...so it's next to impossible for me to drive without assists. Also, I'm assuming you're using v2.6, correct?
Hungary (default set up) - The AI is actually pretty good, however if theres a lapped car they generally get stuck there and drop several seconds. I guess that cant really be fixed. Another thing I noticed is that they almost never overtake me, maybe a possible solution could be to slightly increase their rear grip so that their traction is increased and have a better exit out of the last turn. Another issue is that the AI slows down MASSIVELY in turn 14 if you are following them closely. They will take the inside line and defend there, however they slow down so much you can easily pass them on the outside.
I think a number of your issues are simply due to the racing line the AI takes. I've made the blocking as good as I know how to make it, but it boils down to what line the AI takes when blocking. I haven't yet looked into altering the racing line for the AI, but it's on my To-Do list.
Bahrain (default set up) - Same as Hungary, they slow down way too much in turn 5/6 if you are close to them. It should be close to impossible to overtake there, maybe you could make them to completely ignore the player in those corners. Other than that the AI is very competitive.
Same as above
Italy (default set up) - The AI goes a little wide at turn 1 and thus get a crap exit on the following straight. Needless to say its very easy to make up a lot of time there.
This is probably an issue with hill's Competitive Braking Mod since the issue is with the braking zone for the AI. You might want to drop him a buzz. I haven't actually tested at Monza yet since I know it seems to have a few issues of its own.
Brazil (default set up) - I feel the AI could be maybe two tenths faster overall, its not very difficult to beat them. Another problem there is that they dont open the DRS until their car is completely straightened up (the activation point is on the exit of the corner) and almost never overtake me.
I'll look into this, haven't checked Brazil since hill's newest braking mod was released. I think I can adjust the AI's DRS to open sooner too.
Spain (default set up) - The AI drops quite a bit of time in the final sector, especially the final chicane. Again increasing their rear grip could potentially allow them for better exit out of the final turn and actually overtake.
Probably a racing line issue again, but I'll see what I can do.
Korea (custom set up) - Very nice, the only flaw I have spotted is that they are much slower in qualy (full session) than they are in the race.
I can check grip levels for quali vs race and see if adjustments need to be made.
USA (custom set up) - AI is insanely fast, I would dare to say even too much? I was never able to win there even with a slightly modified setup. Most notably they have insane traction out of turn 11 and with the epic long DRS zone they just fly past you.
Will check this, haven't looked at it since hill's latest braking mod.
Malaysia (custom set up) - Again the AI is crazy fast, to me it seems their front grip is a bit too much (or the player's is too low) because Im not able to match their speed in turn 11/14 for example.
Tough to say...I find Malaysia to be pretty competitive. I find the advantage I typically gain in sector 1 is lost by the time I get to the end of the lap...though I think this is because of my game pad - makes it a little difficult to be really smooth on those faster, more flow-y tracks like Malaysia and Spa. The turns you've mentioned are notoriously hard corners as well, especially without ABS.
China - Its just hopeless because of the turn 1 issue, I dont even play it anymore.
I had tried lowering the Player's grip level here to the point where the advantage you gain in turn 1 would be dissipated by the end of the lap. But again, maybe my gamepad is deceiving me...
Canada (custom set up) - Nice racing there, the AI is very competitive.
Abu Dhabi (custom set up) - Same as above.
India (default set up) - I was able to win with relative ease altough I dont remember exactly the issues, will test again.
Will check this, haven't looked at it since hill's latest braking mod. Never tested here actually lol...
SPA - Very competitive.
Thats pretty much it, I will try to test the remaining tracks over the next weeks or so.
Sounds great, thanks!
