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I'd try jigging smaller lipless rattlebaits and jigging raps in depth of 15-20 feet, suspended 2-7 feet of the bottom. Tip them with mealworms or bits of nightcrawler. Should give you a decent shot at icing some largemouth, and possibly some of those bigger / more aggressive perch.
Largemouth are happy to run shallow under the ice, my largest in MA through the ice 8.3 came out of 4ft of water... Keep fishing the structure, but don't be afraid to fish it shallower. For jigging, I have had great luck with Salmo Chubby Darter, worked right they swim in large circles...
Has anyone ever thought of what level in the water column the thermoline might be at ?
nice post primepin65 spot on advise