Set your Boost down and replace it with Turbo.
As you lower your boost to 45 and set 10 Turbo, You will have a smoother acceleration.
What you also can do is use this setup.
Boost 50
Turbo 10
Turbo delay 0
Turbo ramp 2
Start RPM 5100
End RPM 17000
Throttle 5
Gearing 7FDR (to start with) Watch the motor temp.
As you don't do full throttle, your car drives easier away.
So for the infield this is better to drive.
When you hit the straight. give full throttle and you fly away.
As you want even more acceleration set your Turbo ramp to 3. Hold on this is fast.