To tell you the truth location for big walleye is more important than lures or bait. I have found that big walleyes like to relate to structure where deep water meets shallow water. For example, a weedy flat that is about 7 feet deep that is very close to a deep drop off. The walleyes will come shallow to feed then retreat back to the deeper water to rest.
Another thing to keep in mind is if you are catching many small walleyes there are usually no big ones around. I have seen that large fish tend to move together and small fish tend to move together but not in the same places.
Don't be afraid to fish shallow for big fish, especially this time of year when the water is warming up.