This track was an intense challenge to get the AI to drive the track the way I wanted. It was several days to figure out the fastest way for them. I did a lap, (a personal best for me) on day one that I figured would be great. The AI hated it... they were running off into the grass and banging into the apex curbs losing time on every turn. Not only that but they were crashing into each other like an junior kart race.
I figured out corner by corner what the AI wanted and I came up with this. The lap we have in fact is about 3 seconds slower than my PB. But the challenge is to drive a perfect lap as far as track position goes, and you need the high speed to get the correct arch, but you cannot slide the car even a little. I would say this track, and possibly Algarve, Val de Vienne, and Putnam Park, were the most difficult to get the AI to max out the lap time and stay more or less within the track limits.
I have completed the Melbourne update with a few extra bonus tweaks, and I will release tomorrow.