You are doing it right, Angela. It is just a different dance for each cat and you have to be patient, as Robin says, until you see trends and patterns. Are you going to get some extra mid cycle numbers today? It may be that he has an early or late nadir - so +3 or +9 can be a helpful number. The more data, the more likely we are to figure things out.
For a beginning diabetic, your numbers are fine. And 1.25 is a tiny dose. And pay attention to the other diabetic signs - is he eating well? is he playing and grooming? Does it seem like he feels better?