Crossfades on the audio will probably help a lot. Splitting the video and audio, and placing the audio on separate tracks so you can get a bit more media-handle to work with can improve the fade.
Pacing on stuff like this needs a smooth touch because it can come off as machine-gunny and start loping in predictable ways that will cause the audience to unconsciously tune out. Rather than cutting pure sound bites for everything include context on some clips too. (Hope that makes sense.)