Bob,

awesome song! I must have heard the version after you raised the level of the 12 string... sounded perfect to me!

I'd kinda like to hear a version of this song with just your voice, but no harmony. I think your voice stands on its own on this song, and the harmony doesn't add anything that isn't already there. The fact that your voice is so unique is a real advantage from a singer-songwriter perspective, and I think you should play to that strength.

If you want to add something in the background, instead of using a vocal harmony that directly competes with the primary vocal, pads or strings are a good way to approximate the human voice without competing with it.

Especially given the fact that your songs tend to be romantic, the strings would be an excellent fit with the genre, and you would be freeing up your vocal in the mix.