This is a replacement for the default handling files, which removes the ability for players to curb and brake boost, to offer players a more fair and balanced experienced to all drivers.
Hai some cars are not taking the affect of the anti bump and are still bump/curb boosting one for example is the sultan2, and i also noticed the Krieger i think has too much downforce and becomes impossible to stop after you get alittle speed, im not the best with handling editing so not sure
There might be a couple that still need tweaking, if you want to do this yourself look for strAdvancedFlags in the handling.meta and put that value into this calculator.
Using the linked tool you can mess with the flags to try and achieve the desired behaviour.