My first successful set up is a modified version of the Quick lowest downforce setting (so where there is xxx I've not touched that area), which gave me a time of 1:26:016 in a Sauber
Aerodynamics
Front Wing Angle: 2
Rear Wing Angle: 1 -2 (both are good, see which works best with your driving style)
Braking
Balance: F 52% - R 48%
Pressure: xxx
Brake Size: xxx
Balance
Ballast Distribution: F 80% - R 20%
Front Anti-roll Bar: 2
Rear Anti-roll Bar: 8
Suspension
Front Ride Height: 1
Rear Ride Height: 1
Front Spring Stiffness: 7
Rear Spring Stiffness: 8
Gearbox
Gear 1: xxx kph / xxx mph
Gear 2: xxx kph / xxx mph
Gear 3: xxx kph / xxx mph
Gear 4: xxx kph / xxx mph
Gear 5: xxx kph / xxx mph
Gear 6: xxx kph / xxx mph
Gear 7: xxx kph / xxx mph
Engine
Throttle map: medium
Fuel: n/a
Alignment
Camber front: -1.20
Camber rear: -3.00
Toe front: 0.09
Toe rear: 0.38
Obviously if anyone can improve upon this set up share it with the rest of us please