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Not sure how much you know about late hunts but if you have never been on one, they can be very challenging. I've not hunted that unit but have been on some late hunts.
That time of year the big bulls separate from the cows and go to secluded spots to lick their rut wounds. They often seek private land where they won't be bothered, or out of the way places where no one goes. If you are seeing big herds of cows, you are in the wrong spot.
That being said, if you can find someone that knows where the big bulls are during that time of year, you improve your odds significantly.
Best of luck