If you make a jerk bait that slowly rises in the test tank, the line you use can affect it when you fish it, too. It will remain slightly buoyant if you use nylon monofilament, but will either suspend, or slowly sink, if you use fluorocarbon, depending on the line size.
I use mono when the water's warmer than 70 degrees, because I do want the bait to rise on the pause.
Below 70 degrees, I use fluorocarbon, so I get either a suspending or slowly sinking action with the same bait.
So many variables, so little time! Hahaha