Hi Jon
Of those listed here, and you might add Hanging Johnny, I would suggest Reuben Ranzo definitely follows that description, having a strong story relating to one individual. I would suggest though that the others having a stable text is more down to repeated copying of the same version by editors. I am highly suspicious of any chanty that uses the 'milkmaid' text in any genuine capacity. To me it is the default text when an editor couldn't print the real sung text because of its bawdy nature.