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Do you mean that they get flat when she's driving a vehicle? If so, then the bug is with the game itself. You will also notice that the original game characters with breast physics are not assigned to driving vehicles. I haven't found a workaround for that yet.
Is the problem you're describing similar?
While it's nice of you to put up videos of the car models, can you at least mention in the video when you've uses your own handling string (just to avoid confusion)?
The handling settings on this download do not make this car look and handle the way your video represents. The car's stance is very different from the original pictures.
Can you also consider installing IMVEHFT so viewers can see how the lights, spoiler, etc are supposed to work?
(In any case, there's an update to the model, awaiting admin approval)