John
I think the 'Stormy' song is very significant. It obviously refers to 'stowing or screwing' cotton. The important question arises, is it derivative or imitative/parody/burlesque. In my experience almost all of the early minstrel songs were imitative/parody/burlesque rather than derivative. In other words it wasn't an actual song used for stowing cotton, but using perhaps some of the words and referring to some of the tasks done by the slaves. In which case the possibility arises of yet another shanty derived from a minstrel song.