Rook
"What if we're a small, independant trader that had a special cargo for Marin & Sons? This would be something very expensive and small (so the 'Bedsheet' could ship it), preferably something fairly important to Captain Marin. After the loss of their two ships, Marin & Sons was no longer willing to pay the cost of the cargo, so forfeited their rights to it. Now we are burdened with either selling it in whatever market we can find, or lowering our cost so that Marin can buy it.
Someone who knows Captain Marin or Marin & Sons a bit better than I would have to refine the story, of course -- I'm just talking off the top of my head. But in general, this one has two lures to our potential targets: A valuable cargo for the taking or buying, and something important to Marin in particular (in case the taking of the ships is an action against Marin & Sons in particular).
If we go with this, we'll either need to pick up such a cargo, or decide now that we're running a bluff and that we'll go after the first target that shows sufficient interest."
I really hope our target turns out to be a slaver as well as a pirate. As long as they leave me alone, I've got nothing against pirates in general. Slavers, however . . .