Sounds like you exclusively worked the lower part of the water column. Next time try moving up in the column with some with a shad rap type crankbaits. Also a lipless crank is worth a try for moving about in the water column. For dusk/dawn periods try longer line trolling of stick baits in shallower water. Depending on the forage base the walleye could be suspended over deeper water.
There aren't any sure fire methods. You will have to keep trying different methods and techniques that may produce fish for this particular body of water. Since there is there is no lake map you will have to build one yourself. In the end your assumption of healthy population of walleye may be incorrect but the process you go thru to make that determination will make you a much better fisherman for all species.
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