Rotating camera makes ball move slower/faster

$$anonymous$$ouse Look script: using UnityEngine; using System.Collections;

 /// $$anonymous$$ouseLook rotates the transform based on the mouse delta.
 /// $$anonymous$$inimum and $$anonymous$$aximum values can be used to constrain the possible rotation
 
 /// To make an FPS style character:
 /// - Create a capsule.
 /// - Add the $$anonymous$$ouseLook script to the capsule.
 ///   -> Set the mouse look to use LookX. (You want to only turn character but not tilt it)
 /// - Add FPSInputController script to the capsule
 ///   -> A Character$$anonymous$$otor and a CharacterController component will be automatically added.
 
 /// - Create a camera. $$anonymous$$ake the camera a child of the capsule. Reset it's transform.
 /// - Add a $$anonymous$$ouseLook script to the camera.
 ///   -> Set the mouse look to use LookY. (You want the camera to tilt up and down like a head. The character already turns.)
 [AddComponent$$anonymous$$enu("Camera-Control/$$anonymous$$ouse Look")]
 public class $$anonymous$$ouseLook : $$anonymous$$onoBehaviour {
     public enum RotationAxes { $$anonymous$$ouseXAndY = 0, $$anonymous$$ouseX = 1, $$anonymous$$ouseY = 2 }
     public RotationAxes axes = RotationAxes.$$anonymous$$ouseXAndY;
     public float sensitivityX = 15F;
     public float sensitivityY = 15F;
 
     public float $$anonymous$$imumX = -360F;
     public float maximumX = 360F;
 
     public float $$anonymous$$imumY = -60F;
     public float maximumY = 60F;
 
     float rotationY = 0F;
 
     void Update ()
     {
         if (axes == RotationAxes.$$anonymous$$ouseXAndY)
         {
             float rotationX = transform.localEulerAngles.y + Input.GetAxis("$$anonymous$$ouse X") * sensitivityX;
             
             rotationY += Input.GetAxis("$$anonymous$$ouse Y") * sensitivityY;
             rotationY = $$anonymous$$athf.Clamp (rotationY, $$anonymous$$imumY, maximumY);
             
             transform.localEulerAngles = new Vector3(-rotationY, rotationX, 0);
         }
         else if (axes == RotationAxes.$$anonymous$$ouseX)
         {
             transform.Rotate(0, Input.GetAxis("$$anonymous$$ouse X") * sensitivityX, 0);
         }
         else
         {
             rotationY += Input.GetAxis("$$anonymous$$ouse Y") * sensitivityY;
             rotationY = $$anonymous$$athf.Clamp (rotationY, $$anonymous$$imumY, maximumY);
             
             transform.localEulerAngles = new Vector3(-rotationY, transform.localEulerAngles.y, 0);
         }
     }
     
     void Start ()
     {
         // $$anonymous$$ake the rigid body not change rotation
         if (GetComponent<Rigidbody>())
             GetComponent<Rigidbody>().freezeRotation = true;
     }
 }

And player controller on pastebin