I’ll put a vote in for Diamond outfitters. Good buddy of mine is a guide for them and he spends a ton of time pounding that unit all year. Pm me if you want my buddies number to feel him out on it. All this being said, the other options mentioned are great suggestions also.
I would give Big Chino Outfitters a call. They killed some monster bucks last year. I met him along with a couple of my buddies in unit 10 while on friends elk hunt. Ended up on the same hill top glassing for elk.