RealFeel generates a standard entry for every car that doesn't have an entry yet. This is negative by default, something like -2500 (at work now, can't check the exact value). It represents the direction and the amount of force that will be taken as +100%, but due to the suspension geometry of this FWD car, it actually has to be a positive value to give the correct feedback. This is not unique to the Clio, the same is the case with the Reiza Mini for example.
The reasons why you might not have to mess with similar settings for other cars can be...
...Reiza cars already have custom tuned RealFeel values, positive and negative as well, ranging from a few hundreds MaxForce up to 16k (Trucks)
...physics are made to match the generic negative RealFeel value
...RWD cars have a bigger tendency to need negative values by default
...FFB is clipping, but you don't notice it during normal circumstances
...there's some magical, undocumented way to define what value should RealFeel add to the .ini file for new cars
Please try to follow the instructions in the mod description, if you still have inverted FFB after inserting the proper RealFeel value, then there's something we missed with Franklin during testing.
P.S.: I only helped testing and fine-tuning FFB for this new version, so I can't really comment on other issues.