You've already invested in the 9 Ah batteries, picking up a Milwaukee Mud Mixer or 2704 bare tool will get you more torque.
Pair that with a 8" Nils and because of the thicker ice look for the 8" with the longer shaft.
Just wondering if you can drive on long lake by hawick? It's a narrow lake and I've never ice fished it before. Any spots I should watch out for? It seems the whole lake is a pinch point which makes me parinoid of the ice conditions not nowing the lake.