I never bought into the "lakers are piled up in the deepest hole" idea. Sure, I see guys jigging them up from 100' of water. But I get all I want fishing 8-18' when they come into the shallows to feed. Nice gradual leveling off areas. I'd look into the area on your map in the lower right-hand corner. Set the traps at various depths along those leveling off areas and spend the day jigging and studying the results.