Are you getting regular ketone tests? With high numbers that is one of the things to make sure you are doing. The numbers could just be the liver reacting to lower numbers than Sushi has seen for a while or a reaction to the dose reduction. Numbers in the black are discouraging, but it looks like Sushi is getting rid of them fast. If Sushi was staying in black that would be more worrisome. If you look at Neko's numbers you'll see lots of black, unfortunately, but her liver is slowly getting used to the lower numbers. She is one bouncy kitty.