If you are having a hard time keeping the car on track here are some tips within the setup to change:

A twitchy rear on the entry of the corners: Higher value of Brake Bias (I  recommend 52.7)

Finding the tyres loosing grip more than you would like in the race:  Try Lower Camber values (I  recommend 3.7 degrees on the front & 3.2 degrees on the rear)

If you are having trouble with on throttle oversteer use higher values of rear bumpstop ranges: (I recommend using 25)

Some Tips if you are racing in the wet

. Raise the front ride height by 2mm

. Lower the rear ride height by 2mm

. Soften the front wheel rates to 105000 N/m