Is your project set to preload all sounds on start ?
If so, that's maybe a property of the project you want to turn to "No".
This way you may preload only the sounds you need at first, allowing for less requests toward the server at once, and preloading "as you go along" navigating through different layouts and preloading sounds you will need in the next layout.
That might be worth a try and would be less recoding than the major regrouping you are attempting.
LaDestitute - Using only a single audio format (ogg), if you are doing a web game that could possibly be executed on Internet Explorer/Safari, is not a proper solution.