I was using the 7 for awhile and failed miserably trying to win with it at Cote D'Azur. I went back to a 330 P4 I had and the 3rd try was the charm, as my level 19 Bob in a maxed out P4 won.
A word of advice: never tell your Bob to overtake before the tunnel as he will attempt to cut the chicane and will crash into the wall. This same advice is to be used for the last corner, as he will do the same exact thing.
What is weird is that similar to the Shelby Cobra in GT3, which although overpowered in the American Cup still couldn't win, the 2J's have an unusual tendency to botch either of these two corners mentioned above and crash headfirst into the barrier, creating a logjam behind them of usually 4 or 5 cars who fail to avoid the incident. This only happens if the 2J is NOT in first as it will fail-bomb (dive-bomb) into the corners with "stopping" results. This incident happens with other cars as well, but not as frequent as I've seen the 2J do.