I feel your pain. I'd rather play Dirt 10x and get the full 1K each time than play this piece of trash but now I'm stuck with 80 points in it and need to continue.
I haven't gotten up to the part your stuck at yet but will try if I get there. Can you help me? I'm stuck at the first stage of that level too where you have to drive the full 100% of the race in only 2 minutes but I can't stop in time at the red goal.
P.S. your gamerscore is F'n amazing!