I like to slab anytime of year, as long as the walleye are 20' deep or more! It is one of my favorite ways to fish, if i am in a boat. This time of year I would imagine they will be in 35-50' of water along breaks into the channel?
I use 3/4 oz chrome Hopkins, Rocker Minnows and Bomber Slabs for deep water. Up shallower I like Rocker Minnows, Silver prism Krocs, and Buckshot Rattle Spoons. Sometimes Blade baits (like Silver Buddies and Cicada's) work well also! Just drop them to the bottom then pop them a foot or more off the bottom. The strike usually occurs as the spoon is flutting down.
Some people use spinning gear, but I prefer Baitcasting. I have a 6 1/2 MH trigger stick and a baitcaster with a flipping switch just for slabbing. The flipping switch allows you to immediatly reingage your reel after you drop some line for added depth. I also prefer 10-12 lb mono! You want the spoon to flutter down, not drop like a rock!!!!!! The extra diameter of the mono helps in this regard! Braids are thinner and you will be snagging alot
You might catch Wipers, Bass and Channels also ;D