He is now consistently and willingly staying on his place mat or in a Down/Stay for over an hour without getting up (he watched a movie with me last night and today he helped me with some office work).
Today during our exercise walk we were out in the big pasture and a rabbit shot out of some low trees. I let him chase after it for a few seconds until he was REALLY committed to getting the bunny. I called him back and paged him and he ignored me and so I gave him a correction with the collar and he quickly left the chase and came running back to me and sat down. When there isn't a bunny around his recall is near perfect, I haven't had him fail to come back at all and only rarely does he forget to sit. When a distraction like a bunny is around it is not surprising that obedience left his mind. The success is that I was able to get him back even when he was in a predatory state. With practice it will be possible to get him back with just a page from the collar or a verbal command.
Tomorrow I have lessons all morning so Cowboy gets a break to sleep in and then it is back to work in the afternoon.