No doubt leadcore and copper will work on the eyes. I have run core for them but I have never fished copper for any species. Running boards, I have never saw the need to run anything but inline weights, or bouncers, with crawler harnesses, spoon rigs, or cranks. In the Spring I use the shallow diving minnow imitators in close. It takes at least twice or three times as long to get the core or copper set, not to mention the time it takes to bring it in. In the mean time you could have set two or three simple rigs up. I'm not against anyone doing there thing and experimenting with different presentations. The K.I.S.S. method works for me. Keep it simple and put fish in the box. JMHO