Lots of guys on here could help you.
I troll a plain 6 oz trolling sinker with a hook up front and catch as many as I want. Scrape the sinker in a few times so it sparkles. Over the years I've caught tons of Bonita and other Tuna species by trolling at 14-15kts. As a kid, I caught many Yellowfins, Blackfins and Skipjacks too along with a Wahoo and Dolphin most days as we rand down to the Campeechee Banks. I caught Sailfish and White Marlin occasionally and once had a run-in with a huge Blue. We trolled at 8kts because that was cruise speed.