Ok, here's what you do:
1. Uncheck all the "export in 1st frame" boxes for all your movie clips
2. Make an empty keyframe on the 2nd frame of your timeline, after the preloader, but before anything else.
3. Make a "dump" movieclip on that 2nd frame.
4. Within the "dump" clip drag an instance of each Movie Clip you have exported from your library.
5. Make a 2nd key frame within your "dump" clip
6. On the 2nd key frame, make a layer for each sound you have exported in your library (each layer should have a keyframe)
7. Drag a copy of each sound item from your library onto each keyframe/layer of the 2nd frame of your dump clip.
8. Test your movie and it should show even loading.