Had the same games this winter...
The only way I could catch these lazy guys was with a tiny small dead minnow.
Let the minnow slowly sink to the bottom, wait, lift it fast for 2 or 3 secound one or two feet and let it sink to the bottom again. After that my float always went down...
For the fish this looks like to be an easy to catch bait...
Btw, I caught small lakers and rock bass! in 60 feet under the ice. Forget it.