Congrats. Yeah it certainly is a toughie.. For anyone else I found that racetrack to be quite easy. All you do is watch the color that the enemy has just passed and run to it, follow that color until another passes you by and move to that color. You might die once at the crossroad of death but other than that it should be easy. remember you can stand underneath the ramps for a breather if you need too.
As for how you got an A on 11 deaths?! is a mystery as A is 10 deaths or less. thats most likely why you had to replay it because you really got a B.
Since it seems that most people now are getting the full 1000 points I might move onto another game in need of some help
I'll still check back but not as requently :P