Try the following setup. It is somewhat preliminary, but for me it works. I tested this on the Monza track. You should be aware that there are faster (and easier to handle) race cars out there.
Tyres racing soft, tune everything (turbo 3, rigidity improvement...)
Speed: 370 km/h (TM final: 3.070)
DF 50/70 LSD 14/38/18
Suspension: height -20/-20, spring rate 16.2/17.4 (front/rear)
Dampers: ext. 7/6 comp. 6/7 ARB 4/6 camber 0.5/0.5 toe 0/0.16
brake balance 6/5
You may also try to decrease the springs and increase the camber (especially the front camber). The car still tends to understeer a little bit when exiting corners, so be careful. Hope that helps!
Greets,
jazzy