Really cool about the brow tines changing within your local area, I have never witnessed anything similar in our area. Brow tines have been unchanged for the 35+years I have been hunting in our zone and they are very similar to the brows on your buck. Many bucks in our area that just miss the book are shorter than normal in the brow tine department, and would make the book if they had even slightly above average brows. If they had brows like you see on some of these IA and IL bucks they would easily make book.