I'm pretty sure your best bet would be to hit Henry's around spawning time. I'd focus on the areas where the water comes in like Duck Creek. A fat 22-24 incher would not be at all out of line. My son caught a 22 incher through the ice there a couple days after Thanksgiving last fall, but it didn't have the hooked jaw and bright colors you are looking for. There are not many lakes with the quality of Brookies that will exceed Henry's. The size is good there and in recent years the quantity has been good as well. The last 2 times I've ventured over there, I'd say that about 30-40% of the fish I caught were Brookies and the smallest I've picked up was around 14 inches or so.
Actually, re-thinking it, I'd try in the creeks themselves, if they are open. That I'm not sure about. Tributaries may be close. It would be worth investigating.