I have only been there once so my opinion my not matter but here goes...
I really like the uniqueness of the track. It's pretty good for having zero elevation change. I would modify the rhythm section in the middle. Jump faces are too close together, too short, too steep, and it doesn't flow well. That section is wide open in my opinion for some awesome change.
I like the fact there aren't any jumps in the sweeping back stretch, lends to the uniqueness. I would modify a couple of the 180 turns to entice different line choice. Just putting a hump on the inside doesn't always solve the problem, the outside needs to be modified to promote faster speed to equal the shorter distance traveled by the inside, positive camber on the outside.
I would add long rollers after the big double and after the finish line jump and possibly down the next straight also.