Hook size. Adding lead, beads, cones whatever works. Then how much material I add. All kinds of ways.
Like I’m just getting into jigs. When I add just my dumbbell eyes that’s perfect for a light current but when I added dumbbell eyes and jig bead it became to heavy and sank to drag on the bottom in light currents. Gets snagged easy in light but heavy current it swam and would sink perfect in the holes.