Er. . . I'm not exactly sure how to rate this one because I don't know exactly what you were going for. I tuned my "Xsara RALLY Car" to 500PP and it felt pretty good with your suspension settings. Most of my rating on the good side is for getting the car to behave appropriately on a much lower ride height. It's about 1 second faster around Trial Mountain for me than the stock setting and feels much more like a street car.
You might double-check your PP though, the car set up this way can't be 274PP or whatever you have. There's also no car called a Xsara Touring Car, so I'll assume you meant the Rally one. The transmission and LSD are still stock settings, but it feels pretty good there so I won't knock you for that one, but I do feel there's a bit of room for improvement in both those. I felt that the car also handled better without the extra ballast you put on which further unbalances it, and was faster without the excessive downforce you have listed (which I also don't feel is necessary even on a super tight track and sports tires).
It IS slightly faster than stock (if you leave the ballast off and downforce at stock settings), and it handles great lowered with your suspension settings. Brakes are good too.
I think if you double-check a few numbers, consider leaving off the ballast and extra downforce (unless there's some use for them I didn't realize), and fine tune the LSD and transmission you might have a 5/5 here.
The ballast was put on because in the series that I use it in has a minimum weight limit 1000 kilos. I'll update the tune description with the basic Technical Specifications for the series in terms of HP, PP and Weight Limit