If Mudcat mentions any real world maritime tradition or vocabulary, of any faith, in your new and revised history of the San Francisco 'hog-eye' well, I missed it again.
You wouldn't be my first choice as look-out. Your frame of reference for all things Afro-Americana is the Tom show. The standard chanty paradigm has the same relationship with minstrely's “locomotive lecture” as the Greek keleusma. It has been processing the bulgine as a real world piece of African-American ship's gear.
Ship Margaret Evans, songs
The glossary debating minstrely's authenticity and racism is a multi-volume set. If you lot have solved the age old riddle of the tragic mulatto all by your lonesomes… show your work. It's a reasonable request.
The informed, intellectually honest answer is “we.do.not.know.;” but… De History 'Ob de World lecture sub-genre probably shouldn't even be lumped in May Irwin's Bible Stories (Darkie Sunday School &c &c ad nauseum. – Baptist Sunday School words offensive?)
Much less with a Harriet Beecher Stowe piece promoting the Northern abolitionist cause.