Does the plastic need to float, I have a bunch of yum dingers that I could cut in half?
Technically, no, it does not need to float. But practically, I’d say you will see a noticeable difference between something like the Z-Man TRD/Tickler etc. compared most other plastics.
If you search YouTubes of underwater finesse/ned fishing, you’ll find lots of videos that show just how effective that floating little TRD is while the mushroom jig hops along the bottom.
Since I started learning the ned 3-4 years, ago I’ve caught more fish of all species (and so many river smallies) on it than any other lure and I now have to force myself to try out other stuff instead sometimes.
My number one tip is to relax and let the rig do its work; so many of my catches have come while I just let it sit there, followed by a quick drag/hop or two all the way back to the boat. I also put out several feet of extra line after my cast to make sure that it can float down to the bottom entirely naturally, and only then do I start working it.
p.s. I also usually avoid bed fishing, but earlier in June I had a rare opportunity where the water was so clear and shallow that I could see the fish, the bed, and my ned rig in real-time. If I dropped it down right off the bed, they would sit at stare at, even if I wiggled it around. But the second I started it dragging it away with a little hop they would charge at it. It was obviously not a perceived “threat” to their beds at that point, but proved to be an irresistible snack nonetheless.