My favorite large bait is the Lindy Watsit grub. The make them in 4 sizes but what makes the large on so great is they are only 2 inches long but they are larger in diameter than most crappie baits. They are about the diameter of a mans thumb. I also like the Arkie XL pro model tubes. They are 2.5 inches long and have a larger profile than normal crappie tubes. The Bobby Garland Slab Docktr is also a large bait for crappie. I have never used one but they do look promising.