Flash :: Empty Space After Tweening Movieclip?

I'm filling arrays from a XML. These arrays have dynamic textFields inside them, and these textFields are childs of a movieclip.

I tween this movieclip, therefore making the array of textFields animate on the stage one by one. There are two sources of XML, one from an actual site, and another from a XML stored in the hdd. First i fill the arrays of textFields, and then animate the movieclip. I do this for the first one, then animate it, do it again for the 2nd one, animate it, again for the 1st one, animate it, so on so on.

myTween = new Tween(mc,"x",None.easeNone,sizeOfStage,0 - mc.width,mcSpeedAuto,true);

my tween ends at 0 - mc.width, the problem is, if i tween first the
"bigger" XML, when the next one which is smaller gets tweened, there's loads of empty space before it tweens the big one again (tweening whitespace?).

myTween.addEventListener(TweenEvent.MOTION_FINISH, onFinish);

onFinish i clear all the arrays (otherwise the tweening of the 2nd one would still have information of the 1st one e.g: 1st has 25 fields, second has 10, 1st shows it's 25 fields, 2nd shows 10, and the 15 that were left from from the 1st one) and call the tween on the 2nd one. I thought that by doing this i'd be clearing all that white space too, apparently not. I think the mc.width just keeps the "bigger" value and always tweens with that, taking longer to end in the 2nd case. I've tried setting the mc.width as the sum of textfield width's everytime i fill the arrays, but this hasn't worked either