30K Banner Limits

We are creating a 30K flash banner for a client but having trouble getting the swf file down to 30k with limited animation. We've been following the advice about keeping PNG/JPEG files really small and cropping images to fit and keeping the images sizes down in the library but still can only get the size of the swf file to 47k. We animate the file in Flash or AE and still have problems with the file size. What is the trick? Is the 30K limit the initial file size with additional objects loaded from a directory? Is there a program that compresses the file down while keeping the quality there?

Any new tricks or links to a better solution would help!

Thanks!

Alex