This does seem strange, Lisa. He isn't reacting to the .8 as we hoped. Your choice, I think. He was in generally regulated numbers at .6 There is nothing wrong with that. The .8 isn't causing inverse curves or particularly high and flat cycles so it's hard to say definitely that it is too much.
If you want, try the one unit and maybe we will see the inverse curve that will tell us up is the wrong way, or maybe he will break that blue barrier. Or go back to the .6 and have a regulated cat.
The only other variable is your insulin - if it has pooped out and just isn't causing many changes.