Any ideas how to make this anim smaller?

hi folks
i have this pre loading animation, created with a mask.
http://members.optusnet.com.au/apcw...b_loader03.html
Sadly the shape tween wouldnt work its magic so is all key frames , using this movie as my preloader blows frame 1 out to 75kb. Does anyone have an idea how i might bring it down a notch or two?

Also i wanted the animation to tween in sync with the bytes loaded, so at 100% its as burnt all the way through, any ideas? i know you can change the _x, _y, _width etc based on the getBytesLoaded , is there a way to corelate it to the frame number of a movie?

p.