Originally Posted by: IR STiGGLES 
Raise the decel
Or if you have really high deceleration already lower it.
Too low decel doesn't act swiftly enough and lets the car rotate too fast, which leads to other rear tire lose all grip, and as only one gripping tire cant hold the rear end in line it will loose grip also, resulting in slide.
Too high decel acts too quickly, and locks the rear axle too swiftly, forcing the rear tires in too close rotation speed, which leads to situation where the tire on inside of the curve rotating too fast compared to distance it has to travel, which leads to same situation as too low decel. especially when you suddenly release throttle or brake. Although too high decel usually causes understeer.
in other words play with the decel setting to find a sweet spot.
Other thing that might help is softening rear antirollbar, but this might impare to the handling elsewhere, specially if softening it would lead to bottoming out.
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