GUITexture is lagging my object

Hi, I'm making an mobile breakout game and I got a problem when created the controls.

I made 2 GUITextures to move the paddle (left and right). But the way I made it's lagging a bit the paddle. It's not a smooth movement like when I was using OnGUI buttons. Also when I press both textures, at the same time, the paddle starts to move randomly to the sides.

This is my code:

 void Update () {
     foreach (Touch touch in Input.touches) {
         if (touch.phase == TouchPhase.Stationary && ControlLeft.HitTest (touch.position)) {
             transform.position += new Vector3(-moveSpeed, 0, 0)*Time.deltaTime;
         }
         else if (touch.phase == TouchPhase.Stationary && ControlRight.HitTest (touch.position)) {
             transform.position += new Vector3(moveSpeed, 0, 0)*Time.deltaTime;
         }
     }
 }

It probably must be result of my bad coding. What should I do to make the movement smooth?