I have an electric strike master. 8″ auger in 3.5+’ of ice in -25 or colder weather is tuff on the batteries. Eight holes is about it in those conditions on the 12 volt battery alone. When you are fishing those conditions you are usually traveling via truck, atv or some other vehicle that has a battery. In that scenario you can keep drilling no problem with the accessory cable that comes with the electric augers.

I would start at 35′ and go from there. They are usually 35′ or deeper until the lake starts to turn over. I have caught walleyes as deep as 70′ on Namikan. Many times frozen shiners will out fish all other baits on the lake. Check out the east side of Kubel, East side of Johnson bay. East Namikan reefs can be decent too if you have up for a little trip. Worth he ride since the pictographs I the narrows are close by. Another decent spot closer to Williams is just west to NW of Sexton island. Good luck.