Neil,

As far as having the lyrics vary somewhat with each chorus, I think you are ok with this arrangement to keep it that way with this ballad. If the song is a "strong chorus driven song" and the music and lyrics are "yearning" to return to the hook, then it's best to keep them the same lyrically--changing chorus lyrics works with some songs, others, not.

This song for me has the "music" almost "randomly" changing keys or sliding out of pitch in several places. It would be a challenge to sing the melody with this music as is. I'm not sure of your process, but to me it sounds like the music isn't consistently maintaining the correct key, making it difficult for you to remain on key.

I like the story and lyrics, but would look at the music processing for improvement.

steady-eddie.