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 exits T1 and for the T4
      - TC3 exits T3 

HotLap/Qualifying lap adjustement:
- Target psi tyres 27,0-27,1
- Front Toe: increase 1-2 clicks if you want more turning
- 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
- Rear Antiroll Bar: increase 1 click if you want more turning 
- Rear Ride Height: don't touch

Race adjustement (advice):
- Target psi tyres between 27,1-27,2
- Front Toe: increase 1-2 clicks if you want more turning
- Rear Toe: decrease 1-2 clicks if you want more turning OR don't touch OR 0
- Front Antiroll Bar: decrease 1 click if you want more turning OR increase 1 click if you want more stable
- Rear Antiroll Bar: increase 1 click if you want more turning 
- Rear Ride Height: maybe you can decrease 2 clicks maximum

My best lap with this setup: 1:26.960 (on a mega lap, there is the possibility of doing .8 mid, so you can improve so much my time)

Good Luck and Have Fun.

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