The bigger fish do respond to the larger baits and so do the smaller fish. I have caught fish smaller than my baits on many occasions but most of the time the fish increase in size. In pre spawn conditions and in post spawning conditions I like to use a larger bait because in nature a larger minnow contains more protein than smaller ones. This is what the walleyes are looking for right before the spawn and right after, they need more protein in either sustain themselves or to rejuvenate. The best methods to catch spring walleyes also depend on the stage of the spawn period you are fishing.
Walleyes are the one fish species that the right rod makes the difference.
Being able to feel that subtle bite can only happen with quality rod. I know from experience that the line has Berkley, low visibility, and low memory in cold weather. New emerging weeds are usually the best area to find these fish but also rock and wood shorelines are outstanding locations. Keep in mind that wood cluttered bottoms are on of the best spring walleye producers, but you might have to carry a large supply of jigs. I am located in Phelps, Wisconsin area, close to several fishing lakes.