Your tune on this had more understeer than I care for, especially at 500PP. I played around with your settings. I hope you find this to be more suitable for this car:
Suspension
F R
Ride Height
110 115
Spring Rate
5.20 3.60
Dampers Compression
3 4
Dampers Extension
5 6
Anti Roll Bars
3 4
Camber, I left alone.
Toe Angle
-.10 -.10
LSD
6
5
6
I added 48kg of ballast to 50% as well. Please let me know what you think, whenever you get time. By the way, this is tested at 500PP, on Sports Hard tires.