Excellent track, with a really good flow and great details along the way. A must-have, especially in high end modern GT and endurance class.
One problem unfortunatly, the AI seems to me particularly slow. I usually run around 95 to 98% depending on car/track combo, but even at 100% here, it's very easy. The AI don't use the whole track in corners, the racing line is, well, odd sometimes, and they usually brake hard on some smooth turns that I easily go flatout. Real problem is : I have no idea how to help you to improve it... So, suggestion it is : make AI harder please ! Ahah
Beside that : congratulations. 5/5 for me!