Asuming your driving line through the corner is correct.

Change only one setting at a time in small increments

From more to less influence

• Increase front splitter angle
• Decrease traction control - slip
• Increase rear wing angle
• Increase front ride height
• Decrease rear ride height
• Decrease rear anti-rollbar stiffness
• Decrease rear spring stiffness
• Decrease rear slow bump and front rebound damper stiffness
• Increase rear tire toe-in
• Decrease differential power locking
• Decrease differential pre-load

Generally if a car is oversteering out of a corner the weight is not shifted enough or the transition takes too long over to the rear of the car. To counter that, the rake of the ride height can be decreased or the rear suspension softened to allow the weight shift rearward quicker. Additionally by decreasing the differential power locking and/or pre-load can help with keeping the rotation in control out of a corner.

Additionally to help with keeping the rotation under control on exit of high speed corners, increased rear or decreased front aero will help move the aero balance reareward, although increasing the rear wing will have a negative impact on the cars speed.

To keep the overal slip angle of the car under control, the Traction Control Slip setting can be increased, however this will shave off some speed on the exits.

An increase of the rear tires toe-in will also help with the stability of the rear of the car at speeds.