Camera not facing back of character

Ok so my problem is as such. I have a character model in my game. The character model is the parent to an empty game object named CameraTarget which is being used as, you guessed it, the target for my camera.I have the script below attached to the main camera with the CameraTarget set as it's target.

The problem is that no matter what direction my character is facing, the CameraTarget is facing, the camera itself is facing when I click play rather than defaulting to the back of my characters head like I want it to, it always points off in the same direction. If I hold down the right mouse button down and look around and let go it snaps back to the same spot (as it should) but I find that this often times means it ends up snapping to the side of his face, or even the front of his face (depending on which way he is facing at the time.

How can I get the camera to realize it should be facing the BACK of the target?

 using UnityEngine;
 using System.Collections;
 
 public class Camera : MonoBehaviour 
 {
     
     public Transform target;
     public string playerTagName = "Player";
     public float walkDistance;
     public float runDistance;
     public float sprintDistance;
     public float cameraHeight;
     public float heightDampening = 2.0f;
     public float rotationDampening = 3.0f;
     private float _x;
     private float _y;
     
     public float xSpeed = 250f;
     public float ySpeed = 120f;
     
     private bool cameraButtonDown;
     
     private Transform _myTransform;
     
     void Awake()
     {
         _myTransform = transform;        
     }
     // Use this for initialization
     void Start () 
     {
         if(target == null)
             Debug.Log("The camera does not have a target.");
         else
         {
         CameraSetup();
         }
     }
     
     void Update()
     {
         if(Input.GetMouseButtonDown(1))        //Use the input manager to make this user selectable
         {
             cameraButtonDown = true;
         }

         if(Input.GetMouseButtonUp(1))        //Use the input manager to make this user selectable
         {
             cameraButtonDown = false;
         }
     }
     
     void LateUpdate()
     {
         if(target != null)
         {
             if(cameraButtonDown)        //Use the input manager to make this user selectable
             {
             Debug.Log("Right Mouse");
             _x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
             _y -= Input.GetAxis("Mouse Y") * xSpeed * 0.02f;
             
             Quaternion rotation = Quaternion.Euler (_y, _x, 0);
             Vector3 position = rotation * new Vector3(0.0f, 0.0f, -walkDistance) + target.position;
             
             _myTransform.rotation = rotation;
             _myTransform.position = position;
 
             }
             else
             {
             _myTransform.position = new Vector3(target.position.x, target.position.y + cameraHeight, target.position.z - walkDistance);
             _myTransform.LookAt(target);
             
             _x = 0;
             _y = 0;
                 
             float l_wantedRotationAngle = target.eulerAngles.y;
             float l_wantedHeight =  target.position.y + cameraHeight;
                 
             float l_currentRotationAngle = _myTransform.eulerAngles.y;
             float l_currentHeight = _myTransform.position.y;
                 
             l_currentRotationAngle = Mathf.LerpAngle(l_currentRotationAngle, l_wantedRotationAngle, rotationDampening * Time.deltaTime);
                 
             l_currentHeight = Mathf.Lerp(l_currentHeight, l_wantedHeight, heightDampening * Time.deltaTime);
                 
             Quaternion currentRotation = Quaternion.Euler(0, l_currentRotationAngle, 0);
                 
             //Set the position of the camera on the x-z plane to:
             //distance meters behind the target
             _myTransform.position = target.position;
             _myTransform.position -= currentRotation * Vector3.forward * walkDistance;
                 
             //Set the height of the camera
             _myTransform.position = new Vector3(_myTransform.position.x, l_currentHeight, _myTransform.position.z);
             
             //Always look at the target
             _myTransform.LookAt(target);
             }
         }
         else
         {
             GameObject go = GameObject.FindGameObjectWithTag(playerTagName);
             
                 if(go == null)
                     return;
             
                 target = go.transform;
         }
         
     }
     
     public void CameraSetup()
     {
         _myTransform.position = new Vector3(target.position.x, target.position.y + cameraHeight, target.position.z - walkDistance);
         _myTransform.LookAt(target);
     }
 }