A few things:
Only import wav files. MP3's don't retain loops points accurately enough (ie, they have crap added to the ends of the audio that make it nearly impossible). The OGG and AAC files C2 makes should work for everything you need. Of course, some platforms loop better than others.
That said, I'm not getting any issues with the audio in Chrome. It loads fine, seems to loop fine, no stuttering. It did take a bit to start the first time (since it was loading it still), but it worked. I find that preloading the music files I need works out more elegantly than streaming (place the files in your Sounds folder, not Music, then have an event preload the audio files you need. Then go to the level once it is ready). People don't mind a brief load, and I appreciate the added control.