I tend to lower the steering ratio because I like to have a more responsive GT3 when I turn my wheel while putting very little angle.
Don't hesitate to raise the steering ratio by 1-2 clicks if you are used to playing with more steering ratio.

TC: - I recommend the TC6.
      - TC5 for the T2 and T11, at the exit of the T6 and T14
Only use TC6 if you decide to stay in second gear. So, make sure you engage enough speed to maintain high engine speeds. Otherwise, shift into first gear and TC5.

HotLap/Qualifying lap adjustement:
- Target psi tyres 26,9-27,0
- Rear Toe: decrease 1-2 clicks if you want more turning OR don't touch
- Front Antiroll Bar: decrease 1 click if you want more turning OR increase 1 click if you want more stable but understeet can appears and you will have to be patient to get back on track
- Rear Antiroll Bar: decrease 1 click if you want more stable
- Rear Ride Height: increase 1-2 clicks if you want more turning OR decrease 1 click if you want more stable but understeer appears OR don't touch

Race adjustement (advice):
- Target psi tyres 27,0-27,1
- Rear Toe: decrease 1-2 clicks if you want more turning OR don't touch
- Front Antiroll Bar: decrease 1 click if you want more turning OR increase 1 click if you want more stable but understeet can appears and you will have to be patient to get back on track
- Rear Antiroll Bar: decrease 1 click if you want more stable
- Rear Ride Height: decrease 1-2 clicks if you want more stable but understeer appears OR don't touch
- Front Brake Ducts: it depends on the temperature
- Rear Brake Ducts: it depends on the temperature

My best lap with this setup: 1:29,775 (on a mega lap, there is the possibility of doing .7 low, so you can improve so much my time)

Good Luck and Have Fun.

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