Continuous touch detection problem.

I have a script which moves the player up and down on Y axis. The script seems to have some problem as its not working as I'd wish it would. A) Its either not smooth (the movement is broken) b) Its smooth but I need to take my finger off screen to do second detection ?

 void Update()
 {
 foreach (Touch touch in Input.touches) {
 
             if(touch.phase == TouchPhase.Began)
             {
                 fp = touch.position;
                 lp = touch.position;
             }
             if(touch.phase == TouchPhase.Moved)
             {
                 lp = touch.position;
 
                 if(lp.y > fp.y)
                 {
                     fingerdistMove = lp.y - fp.y;
                     Debug.Log ("Moved Finger UP " + fingerdistMove);
                     if(rigidbody.position.y <= upOff){
                     rigidbody.AddForce (0, myvelocity*4f*fingerdistMove*Time.deltaTime, 0);    
                     }
                 }
                 else if(lp.y < fp.y)
                 {
                     fingerdistMove = lp.y - fp.y;
                     Debug.Log ("Moved Finger DOWN " + fingerdistMove);
                     if(rigidbody.position.y <= downOff){
 
                         rigidbody.AddForce (0, (-myvelocity*4f*-fingerdistMove*Time.deltaTime), 0);    
                     }
                     
                 }
             }
 }

Now I'll probably get a reply saying take off the Time.deltatime and its already in the physics and change update to fixedUpdate. That is all tried and done and doesn't resolves the main issue. Thanks.