Let's just keep an eye on the numbers. It takes 6+ cycles after a reduction for the larger depot to deplete. Yesterday was the end of the six cycles. It's possible that 10 units is not enough and you'll have to go to 10.5 units. But since he has seen green on this dose, I'd hold it for a few more cycles or see if the numbers are trending up before deciding if you need to increase. It's possible there was some reason for a bounce. Or any chance he got into some contraband food?
How is Maxi feeling/behaving today? How are his litter box habits? Anything off?