Export frame for classes - preload issue

I have a fla with several mp3/wav files that are linked with AS. For each file, the AS sound properties are set to export in frame 2. They are also set to export on frame 2 in the AS publish settings.
However, when the exported SWF loads, it is still taking a while to show the preloader and it is starting at 20% rather than closer to 0%.
I have tried exporting in frame 3, 4, etc. The same issue occurs. It is like flash is ignoring the request to export after the preloader.
I know these files are the culprits because I deleted them and exported the SWF and it showed the preloader immediately and started close to 0%.
The file is 7.4 MB with the files and 5.3 MB without the files.

Is there anything I am forgetting to do or anything I should double check that might clear up this issue? Thanks.