Spanner in the works! How about you can only have one of the big 3?
The big 3 being Acceleration, Handling & Downforce.
If one of them is the CD's strength then that will be the 100 stat of your car at some point.
You can only have 60 in another and 50 in the other. The rest of the car can go to 100 if your able to get there.