Hovercar rigidbody acceleration

Description

I currently have a hovercar working with physics and the script I created is based off of the hovercar tutorial made by Unity themselves. The problem I am having is that the I am finding the acceleration of the hovercar too high and its reaching its top speed quickly. Is there any way I can implement slower acceleration but maintaining control over the vehicle with the current setup I have below?

N.B. I also want this because I want the hovercars to have different attributes like top speed, acceleration, handling, etc.

Info

Tutorial: https://unity3d.com/learn/tutorials/modules/beginner/live-training-archive/hover-car-physics (script can be found under video)

The scripts and rigidbody settings are exactly the same except for some few things:

Rigidbody:

• Use Gravity is off (I'll explain later)

• Interpolate is set to Interpolate (since for some reason my hover car stutters without this)

Script:

Check the code comments for the changes (fixed update part only is shown since physics are only done there)

 void FixedUpdate()
         {
             // I added my own fake gravity here
             Vector3 appliedGravityForce = -transform.up * 9.81f;
             carRigidbody.AddForce(appliedGravityForce, ForceMode.Acceleration);
     
             Ray ray = new Ray(carFlyer.position, -transform.up); // used a child object in front of the car as the position to make the detection more accurate
             RaycastHit hit;
     
             if (Physics.Raycast(ray, out hit, hoverHeight * 1.5f)) // made detection be a bit broader
             {
                 float proportionalHeight = (hoverHeight - hit.distance) / hoverHeight;
                 Vector3 appliedHoverForce = transform.up * proportionalHeight * hoverForce;
                 carRigidbody.AddForce(appliedHoverForce, ForceMode.Acceleration);
     
                 Quaternion targetRotation = Quaternion.FromToRotation(transform.up, hit.normal) * carRigidbody.rotation;
                 carRigidbody.rotation = Quaternion.Slerp(carRigidbody.rotation, targetRotation, Time.fixedDeltaTime * 3);
                 // I adjusted the car's angles to the normal of the ground under it
 
                 Debug.DrawRay(ray.origin, -transform.up, Color.cyan); // just some debug stuff
             }
     
             carRigidbody.AddRelativeForce(0f, 0f, powerInput * speed);
             carRigidbody.AddRelativeTorque(0f, turnInput * turnSpeed, 0f);
         }