Do you have all the necessary tools to land one safely and securely? Fly gaffs? Harpoon? Tail rope? The end game with even a small thresher can get hairy if you're not alert and prepared.
Depending on the current, you can add lead accordingly to the set up to get your bait down. Once down at the desired depth, you can add a balloon (or shark float) to get the line out away from the boat.
I'd be using bunker, a cocktail blue, or a bluefish fillet as bait... but that's just me
