heeey?!
I just had a brilliant idea! So whenever you're ahead of a faster car and you're approaching the chicane, defend on the inner line; even break earlier, doesn't matter if the other car is ahead of you at that moment.
Then instead of keeping first corner inside, second outside to give your opponent room, just go straight on and go for the apex of the 2nd corner in the chicane. You'll give your opponent 2 choices. Crash hard into you, or illegally pass you cutting the chicane, in which case he'll have to return the position to you. WIN!

Or you can be a fair racer and get passed on the outside, knowing you were beaten by a better driver. (Schumacher passes Alesi for P1 at the German Grand Prix...)