I've got it working!
• I upped the tempo to 320 from 80 for two bars.
• I used this chord format:
G..,G. G..,G.. | G..,G. G.
• And then I returned to 80 and a chord of G. to give me a couple of bars of silence at the end of the song.
Here's what the result sounds like:
ending.mp3 Thanks so much for the help! There's still some work to be done on the song, but this brings it a whole lot closer than it was.