I've caught leather jackets with 14 lb green fireline & running sinker down to a small black swivell & 500 mm of 60lb leader & 2/0 circke hook. Shortened the leader as it got chewed up. The circle hook hooked them in the corner of the mouth & kept the leader away from their teeth. Didn't loose any gear. I started out drifting for flathead & upped the size of the leader when my mates line got bitten off. I would have used a smaller hook but the circle 2/0 worked a treat & caught some flathead as well.
