SmoothDamp touch look iOS Android

Can someone help me to smooth the touchlook movement? Thanks! (I've tried for 5h!!!)

 #pragma strict
 
 var sensitivityX : float = 5.0;
 var sensitivityY : float = 5.0;
 
 var invertX : boolean = false;
 var invertY : boolean = false;
 
 function Update () {
     var rect = Rect(427,0,427,480);
 
     if(Input.touches.Length > 0){
         for (var touch : Touch in Input.touches) {
             if(touch.phase == TouchPhase.Moved  && rect.Contains(touch.position)){
                 var delta : Vector2 = touch.deltaPosition; //Input.touches[0].deltaPosition;
                 var rotationZ = delta.x * sensitivityX * Time.deltaTime;
                 rotationZ = invertX ? rotationZ : rotationZ * -1;
                 var rotationX : float  = delta.y * sensitivityY * Time.deltaTime;
                 rotationX = invertY ? rotationX : rotationX * -1;
                 
                 transform.localEulerAngles += new Vector3(rotationX, rotationZ, 0);
             }
         }
     }
 
 }