As weird as it sounds, sometimes just a few feet difference on the dock can make a huge difference. Also, sometimes they will hold in the shadows just out of the light. Last year I tossed in a jig on the back side of the dock and was slaying them. I could see the other side of the dock where 15 or more were lined up and I hit 20 to 30 squid in a row without anyone under the lights getting one. Someone finally joined me and we continued to slay them for about another 15 minutes before the school took off.