Had the late 12B-W hunt four years ago, and the early 12B-W two years ago. I saw about 50-60 bucks each hunt, but the quality was definately better later on. Never hunted the East side of 12B on the Plateau at all, but know someone who did. They found a couple great ones. You have a good tag, make the most of it.
Drive out and lite up the highway east of Kanab, and you will see some absolute KINGS WORLD bucks coming out of the Pauns!!!! Where they go once they hit the low country and cedars is anyone's guess, but they're there somewhere. I never found one for me, but saw a couple 180+ typical bucks killed, and one NT that had to go 220.