Livescope has taught me that a lot of the things I believed about crappie before livescope was not true.
I have found a lot of fishermen fish their jigs too fast. I have watched crappie form a circle around the jig when it is standing still, to watch them scatter when a quick jigging motion is made. As Ketchn said, I use a very slow movement of my jig once it has reached the fishing depth. I don't jig up and down. I slowly move it up a few inches and slowly let it down again.
However I have had days when it took a rapid up and down movement to get them to strike. And I have had days when I had to bump the jig into them to get them to strike. So I start out slow. If that doesn't work then I throw the kitchen sink at them until they bit or I give up and move to the next pile.
So I guess my advice is to try different presentations and different colors until you find what that group of crappie want. And when that group stops biting, you get to do the same thing again for the next group of crappie. Which just proves I don't know much about actually catching them but it is sure fun trying to catch them.