My feedback probs wont mean shit cos no one likes aussies, but anyway here it is.
Overall I feel like the track still erodes too quickly, 15 minutes in, downhills on the approach to corners, eg in between corner 13-14, are severly chopped out. If there was a way to change the speed of the erode or something to something like 25% slower overall, I feel like the race would be better towards the end, instead of crawling around the track in survival mode for half the race.
The tighter corners such as 1, 2, 5, 15 might need a a new tile because those break down to the point where the main ruts is a deep at the riders handlebars. Perhaps even just on the insides, and leave the outside lines as is, to keep the speed up on them.
With corner 1, you could probably get away with using the light brown tile all the way through the corner, you don't exactly see a 4 foot deep rut in the first corner of any track during any of the AMA outdoors, when the conditions are dry at least.
Corner 11, I feel the very inside line needs to be just slightly flatter. When the rut starts forming there, feels very easy to slightly tip into the rut and then as a result hit your shoulder on the ground as crash. Maybe that's just a problem with my own riding, feel it was worth mentioning.
Hope this helps somewhat.