I originally came in here looking for help on the original topic, but saw this and needed to correct it. The 190 you're seeing is the sum of your precision and aggressive driving skills. It's not the 80 minimum that you need to pass. The game keeps a tally on the left-hand side of the screen, by itself, of the drift score. The game probably has glitches, but this is not one of them.
My issue on this particular course is that the Audi R8 won't hold a drift for longer than 7 drift points per turn. And since there's only ten or so turns, I'm not even getting the 80 minimum just to move on.