Hey,
I took a sheep out of that unit a couple years ago. Scouted all the guzzlers like you're doing, etc. There's one trick to know about hunting that area around the Joyce guzzler. Quite often those sheep will sit on those little ridges to the north and east of the guzzler. From there, they watch the road coming in off the highway, and when they see you drive up that road to the Joyce guzzler, they're gone.
My suggestion is that when you first pull off the highway, and come in the gate, turn east and go down the fence line until you get to that little mining/prospecting operation, then turn north. The road will take you a long way toward that big butte to the north of you, but will eventually die at the foot of it. Hike north, going around the east side of that big butte. There are some good sheep spots in there, but eventually, you'll get to the north end of the big butte. Peek over and glass those little ridges to the north of the Joyce guzzler once you can see them. The sheep like that north east end of the mountain, around to the east of the Joyce guzzler, especially early in the morning.
I learned this trick the hard way. We'd sometimes see sheep leaving the guzzler, and we'd see sign, but couldn't ever see the sheep. Then we did what I'm telling you to do, and we'd see them camped out on those little ridges north and just a tad east of the Joyce guzzler.
Also, that 9 Fools guzzler is a great spot, but look for the sheep over to the west of it. There's a knife edge rim on that runs north and south, and there's a beaten path up on that rim. The sheep will camp all along on that trail where they can bail off to the west if they see you. Good luck.