I am not sure how you guys manage the NASCAR one but its the worst.
It's pretty simple. There's only one trick to any event on the nurburgring, and it's to know the track.
Gold the AMG events (it can be done with decent ease by watching some of the commented movies on youtube), and you'll know exactly how to take every single corner in the nurburgring while shaving off several seconds in ways you couldn't even imagine.
After golding the AMG I can easily "image train" the track without even needing to watch the game anymore. Ever single corner of it in sequence. Once you can do that, you're set.
The Nascar event is the only one in the whole 12 seasonal events so far that I golded on the first try.