When trolling up there in that clear water. I had a lot of luck with a 8" Swim Whizz in Walleye color , around the Cape Vincent area. I use to bump rocks with it too. The Walleye pattern was greenish, not brown. You may not want to hit bottom, with a expensive custom lure. When casting, I used a white Mepps Giant Killer of deep drop offs. I think natural colors in clear water are better. Best of luck !