Good job on the signature.

What do you mean by "combo food"? Is he being treated for hyperthyroidism? Hyperthyroidism can impact blood sugar numbers.
A note on the spreadsheet, you have a comment on the top that below 60 is hypo. That is not true. A cat not on insulin can test even in the 40's, we just don't want cats getting insulin to go that low.
When following SLGS, people will hold the dose for a week, do a curve, then decide if the dose needs to be increased. In that week, people need to get preshot tests to make sure it's safe to give insulin, and where they can, spot check tests, including at night time. The goal is to try to find out how low the dose is taking the cat. Lantus curves typically are higher numbers at preshot, then the numbers curve down somewhere in the middle of the cycle (time between shots), then back up to the next preshot time. Many cats go lower at night, so we suggest getting a test just before you go to bed at night, to see if he's going lower at night.
I don't see a curve on the 1.25 unit dose, though there was one on the 1.5 unit dose before you reduced to 1.25 units. The goal of SLGS is get nadirs or low points of the dose in the 90-149 range. With the data I see, the increase was OK. But there are still a few what we call "white spaces" on the spreadsheet, where there is no data. If you can get a bit more tests than you have done, with some more night data, we can make sure the 1.5 units is not taking him too low.