Wow now that is what i call setting your sights high but if there is any lake in the world that can produce a 4 lb crappie its grenada.Pink heads orange or black body char tail umbrella tubes tipped with a big shiner have worked for me in the past a little kodiac paste or crappie nibbles dont hurt either the water is usually the color of chocolate milk that is why i use big baits with alot of scent.How are you planning on fishing vertical,trolling etc?