Sometimes they like fast, sometimes slow, sometimes twitched, sometimes just reeling constant speed. You need to try all sorts of techniques and colors. But greens are good almost anywhere.
When I first started fishing jigs I had all sorts of trouble. When I finally started making my own high modulus graphite rods and using braid line, many times more effective than before. As someone already mentioned, if you have a "sloppy" rod, and don't set the hook, then you are giving away a lot of advantage. You need crisp actions, at least medium power, and a solid hook set for plastics. I also recommend you try exposing the hook point (no weedless feature) if you have not already done so. A mistake many newbies make is assuming that hook sharpness is not a big deal. It is a very big deal. Make sure your hooks are "sticky" sharp, meaning they will grab onto your thumbnail as you drap the point across your thumbnail. As you gain experience, you'll find out what is more effective, and come to your own conclusions. And you will catch more fish.
Another possibility with clear water canal fishing is that a smaller lure might work better. If you have not tried the Ned rig, I suggest you get some. Very easy to fish, small, so few fish will refuse them, but big fish eat them too. Lighter colors for clear water. Buy both the grubs and the jigs designed for them. After gaining experience with the real Neds you might want to experiment with your own similar options, but start with the real stuff.