If you plan on updating this track in the future, I have a suggestion regarding the AIW. As it is now, the block path is quite aggressive going into T1, the AI moves over to the left a lot, and loses tons of time through the corner. This makes it far too easy to pass the AI, you can just trick them into defending, and then breeze by once they go way too deep into T1. So yeah, my suggestion is to make the block path into T1 a lot less aggressive. The corner doesn't call for aggressive blocking either, so having the AI move just half a car width to the left would be enough I think. This would make the AI more competitive overall I think and improve the overall race pace.
For me, sometimes the AI almost come to a stop on the left side of the track in Thunder Valley, particularly early in a race.