This version uses the following parameters in ai_vehicle_config.xml:
<trackGlobalCurvatureModifier float="1.0" />
<trackCurvatureDifficultyFactor float="1.0" />
e.g. for monaco, they are inserted as such using the values of 0.99 and 0.85:
<vehicle_type name="monaco">
<laDistMin float="10.000000" />
<trackGlobalCurvatureModifier float="0.99" />
<trackCurvatureDifficultyFactor float="0.85" />
<cautiousBehaviour bool="true" />
</vehicle_type>
Fixed circuits includes monaco, montreal, sepang, suzuka, shanghai, brands h and estoril. Please note that there are additional files for monaco for it to work. Make backups and replace files accordingly.
Please note that the values used may not work well if you have other mods, In this case, you may need to adjust the values.