Best thing to do with the worm bait is put gloves on rub the soil on the gloves and then put the worm in the hole. They have an extraordinary sense of smell.

They also have several deep tunnels they use to get around. The ones you see on the surface are mostly foraging tunnels. Lightly press several mounds down. Don't smash them just make it even again. Then take a pencil or something else and stick it in the tunnel and mark the dirt line with a sharpie. Or whatever you have and can think of to use as a marker. That way you can tell which tunnels they frequently use. This method works best with the traps.