Ive fished a lake like that. Tons of deep water. Drill lots of holes and keep moving. Make sure on your search to swing the transducer back and forth in the hole to scan of to the side a little. Dont drop a line until you see fish or spend very little time (minutes) waiting for them. The time most likely will be needed on searching them out. Dont forget to come back and double check holes that where void of fish before. Sometimes they will move in.
On the lake I fished I drilled sets of 6 to 10 holes in half a dozen different locations on the main part of the lake. Then used the 4 wheeler to fish a set, move to the next and so on.
Most of my holes where in depths from 40 to 70′ of water. Fish didnt really start showing up over deep water until after the sun went down. When they did move in many where in the 20 to 40′ range down. Need to take care of those that are pushing over 30′ deep. Many of these will not swim back down the hole or make it far under the ice before floating back up.
Next time I fish this lake my plan is to drill out some of the deep weeds edges during the day or right out from them looking for more daytime fish.
Good lakes to have a few buddies helping with the search. Lots of water for those fish to be hiding in but the reward can be some bigger untapped fish.