One additional benefit to using the hangback method on spoons, both saltwater and fresh, is the fact that by using a swivel to set the hook back, it also allows that hook to rotate 360 and set into a fish. A hook rigged with just a split ring will rotate about 180 degrees, with difficulty. You'll miss some fish because the hook was pointing the wrong way and/or reacts less to where the fish hit your offering. Setting the hook back and allowing the hook to rotate on a swivel will increase hookups by allowing that hook point to rotate freely to a place to set into the fish based on where pressure is first applied to the hook. Even with pressure applied to the back of the hook, it will flip right around to a pressure point and might find home, and you'll end up hooking more fish that way.

For lines, straight 12 or 15# monofilament to the spoon all the way.

"look ma, no hands"