My two cents on kokes through the ice.
A. lures that you can run up and down the water column quickly (swedish pimples, humdingers, and when they are finicky a kastmaster above and icefly are my go to's)
B. Electronics. kokes may come through hot and heavy and blackout a 5-20' water column, but you gotta have your lure in there for em to bite.
C. Find where they run consistently at that specific water, this may take 10 years or 10 minutes depending on your fishing partner.I have caught limits of koke on the ice over 20' of water on some ponds to over 100' of water on others. Haven't quite related structure to anything yet.
D. Wait em out, for me typically good koke spots suck for trout but you have to put in your time for when the schools comes through.
E Be ready, have multiple rods setup so your not fumbling around a fish on the ice when the school is under you. O and typically you are wasting your time re-baiting because they hit anything when they are there.
F Get LUCKY.