If the car has wings, you should increase the downforce values in the Aerodynamic section. I can't tell you value, you have to play around with it.
The max torque value only gives the value range for the curve. In the table, the torque is given with 247 Nm. That's pretty low. Usually, old cars have a torque curve, where the max. torque is only available at the given rpm (in this case 6300). Before and after that peak the curve is lower. Your curve should work. If the car accelerates too fast, you may lower the values before the peak.
