The AI in AC 1.14.4 is not working right anymore on this track.
I made new fastlane, pitlane and track boundaries that makes the AI work correctly again with all kind of cars. Tested with the vintage Lola T70 MK2 Spyder, all modern GT/GT3 cars and F1 Ferrari Opponents 2013 mod pack.
This is the original mod track:
Hope this be helpful