The way I understand this and I maybe wrong is that the bigger slabs don't school as much as the smaller fish do . The bigger fish are more of a predator and are loners. They will hide around cover and bushwhack their prey kindly like a bass does. Now this is what I have heard and you know how that goes(you can't believe nothing that you here and only half of what you see). Now as far as the depth these fish were I at the lake that I fish have found that if the fish bite at one depth they usually all bite at or about that depth. Maybe others can tell me if they think this is right.