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 TC7.
      - TC4-3 at the exits of hairpins T1 (La Source) and T19-20 (Bus Stop)

HotLap/Qualifying lap adjustement:
- 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
- Rear Antiroll Bar: increase 1 click if you want more turning OR decrease 1 click if you want more stable
- Rear Ride Height: increase 1 click if you want more turning OR decrease 1 click if you want more stable but understeer appears OR don't touch
- Rear Wing: increase 1 click if you want more stable but lose so much time in S1 and S3 OR decrease 1 click if you want more turning and more speed for the S1 and the S3 but S2 will be more tricky

Race adjustement (advice):
- Target psi tyres between 27,2-27,3
- Rear Toe: increase 2 clicks if you want more stable OR don't touch 
- Front Antiroll Bar: decrease 1 click if you want more turning
- Rear Antiroll Bar: increase 1 click if you want more turning OR decrease 1 click if you want more stable
- Rear Ride Height: increase 1 clicks if you want more turning OR decrease 1-2 clicks if you want more stable but understeer appears OR don't touch
- Rear Wing: increase 1 click if you want more stable but lose so much time in S1 and S3 OR decrease 1 click if you want more turning and more speed for the S1 and the S3 but S2 will be more tricky
- Front Brake Ducts: it depends on the temperature
- Rear Brake Ducts: it depends on the temperature

My best lap with this setup: 2:15.142 (on a mega lap, there is the possibility of doing .0 mid maybe a little 14.9 very high, so you can improve so much my time)

Good Luck and Have Fun.

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