To fix the garage exit problem open the file "Macau_GP.gdb", go to line 17 and change it from "GarageDepth = 3.00" to "GarageDepth = 1.00"
If only I had knew that before working on moving each garage spot deeper. Took me a couple of hours but it works as well.
I will try your solution to check whether it works as well. I'd rather keep that AIW file as close to the original version as I can.
For the record, I'm nearly done. I've fixed : garage exits (all cars), some corners here and there (Any car can take the straight-line kink without hitting the wall), pit lane entry (cars exiting to pit lane at the very end of the race track, without blocking the fast path) and that shitty tight hairpin for F3 and Boxer.
I'm currently trying to fix the hairpin for Marcas as well but it is a tough nut to crack. I can't have them take a proper line through the turn so that they don't hit the left-hand wall. Even with a custom SVM file for the track... Too much understeering with these cars.
Would there be any way to improve the racing line grip for a couple of waypoints? Now thinking of it, that would be quite a good quick fix.