Weird delay on Tween

Okay... I've run this both ways. The uncommented code works with 0 delay between the tweens. Which is how I want it to work, however, I am unable to check for starting position of the gameObject and send it the right direction, initially. The commented out section is what I'm working on, and works, however... there is a delay once it hits the 8 or -8 that I can not seem to work out where this is coming into play.

 var factoryPos :boolean; //Position of the factory True = Right, False = Left
 
 //Called once to initialize the tween
 function Start() {
 
     //Moves our factory back and forth
     while(true){
     
         onSpawnMove(true);
         yield new WaitForSeconds(1.0);
         onSpawnMove(false);
         yield new WaitForSeconds(1.0);
     
     }
 
 }
 
 //function Update(){
 //
 //    GetFactoryPos();
 //
 //    if(factoryPos == true){
 //    
 //        iTween.MoveTo(gameObject,{"x":8, "time":2});
 //    
 //    }else{
 //    
 //        iTween.MoveTo(gameObject,{"x":-8, "time":2});
 //    
 //    }
 //
 //}
 
 //Sets up the function for the tween
 function onSpawnMove(on){
 
     if(on){
         
         iTween.MoveTo(gameObject,{"x":8, "time":3});
         
     }else{
 
         iTween.MoveTo(gameObject,{"x":-8, "time":3});
     
     }
 
 }
 
 //function GetFactoryPos(){
 //
 //    if(gameObject.transform.position.x == 8){
 //    
 //        factoryPos = false;
 //    
 //    }
 //    
 //    if(gameObject.transform.position.x == -8){
 //    
 //        factoryPos = true;
 //    
 //    }
 //
 //}

Any feedback or help would be greatly appreciated.