The problem is that some cars are still difficult, or almost impossible to race with even if tuned using methods that are far from normal (normal as in what "works" for other cars which are similiar). Not all cars (of the same drivetrain / PP / tyres etc) respond to the same methods, it's quite natural to find an exception to the norm, but when you exhaust all possibilities, far beyond dealing with these normal exceptions and a car is still almost undriveable or un-raceable, to me, there is something wrong there.
After driving and tuning alot more cars now, there's been a couple of cars with other drivetrains that seem to have similair problems.
It's like the game physics allow most cars in most situations to have a field / area where within that area they can be tuned to be balanced or driveable, but somewhere within the GT physics something has happened which pushes a small amount of cars outside this area of usability - even when applying what works for other cars that are similiar and also usin techniques that normally fix the exceptions (i.e. not using ballast of different tyres).
i.e. the R8s etc can work if using unorthadox methods, but 99% of cars don't need these methods, it's quite easy to find good balance etc in a large amount of cars, from hugely diverse backgrounds (from low pp historics to LMPs etc)....
The main culprit in terms of what's wrong is the way these "problem cars" light up their rear outside tyre, causing the back end to come roun or the whole car to spin, so quickly - it's not possible to catch it.
I can try and do a base setup for the Clio and see if that helps you...

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