Slowly but surely; always keep that in mind.
Because progress is so slow, sometimes we need to look back over our shoulder to see how far we have come and it makes our journey a bit easier.
If you look at Tray's ss, what do you see? I see the last red on 5/18/10, and when was the last time you had a red amps? That's Tray's progress. Tray is getting better, but on Tray's time table.
Just think of the first time at a beach in the season. The weather's pretty nice, and it's feeling pretty warm. The water is inviting so you head on down and stick your toe in the water. WHOA that's cold, and you scurry back up the sand to a warmer spot. The next time you put your toe in the water, it's not so bad and you stay in the water a bit longer. You are used to the change and the water seems a bit warmer.
The same goes for Tray's liver. It's why they call it liver training school LTS - just give Tray time to adapt and adjust on his schedule and you just tag along, giving him what he needs.
Don't worry; he'll get there.