chad(my friend) and i went fishing at the ohio river last week. we went a couple of times. we caught 4 flatheads, 5 channel cats, and 3 blues. the biggest being a 5 or 6 lb flathead. we were using kind of small bluegills(about 3 inches). in order to catch the big cats, should i use big bluegills? should they be cut or use live bait and what size?