On the steering question, set your electronics to center. Assuming that your car is already built, unscrew the middle shaft bracket that holds the front and side belts. This gives you access to the steering servo screw that is holding on the servo arm. You can now adjust the servo arm to help center the steering very close to center, then you can fine tune the steering with your electronics. Screw the middle shaft bracket back in. Remember that if you are running the car, it should be on a level surface with appropriate tires.
As for the clutch set up, this is very dependant on the traction level and fuel mileage. Assuming that the motor is tuned correctly, if the car takes off slowly, the gap between the shoe and the bell could be to big, also the spring could be too tight. The EDAM instruction manual is very easy to follow.
Hope this helps
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