Hi Rosie, what I see on your spreadsheet is that you are doing a great job testing during the day, but aren't getting very many tests at night. We determine how to change the dose on Lantus based on the nadir or how low the insulin is taking the kitty. I see he's getting some nice low blues during the day but I don't see what's happening at night. Some cats, like my Neko, do the lowest numbers at night. Would it be possible for you do get a test each night before you go to bed? Or if your toddler gets you up in the middle of the night for something. With a couple more tests during the night cycles, we might get enough information to see what needs to happen with the dose.
Is Chatran still eating the dry food? Other foods I've seen Australians feed are the Whiskas Loaf style, Ziwipeak, or raw mixes. I saw you were feeding some raw food treats. Raw can actually help firm up the poops if kitty is having diarrhea. If he were to change to low carb food from the dry food, that would help the numbers significantly.