If you are not catching them deep, try to set your hooks a foot or two deep, and see if that does not change your luck a bit!  

The best thing to do is set your lines about dusk, and come back in the early morning to bring your harvest in.  Use caution when you are pulling your lines out of the water, because it is not unknown to find a big, old, angry catfish with some fight left in him, and it is easy to get pulled overboard.  Likewise, you can pull up a nasty water moccasin, gar, or snapping turtle as well.  So just be careful when you pull your line from the water.

Using live bait that has blood to it will work well when limb line fishing for catfish, but you can also use fresh cut bait, commercial bait, or even artificial bait in a pinch.

To get the full "How To Setup Catfishing Limb Lines" article you'll need to download it here.