I don’t want to throw too much of a wrench in your thinking but Wendy, who is one of our most experienced members especially with cats who are higher dose like Kitty Boy, suggested you raise the dose to 5.5u twice a day and leave it there six cycles. You started but then you dropped his dose to 1u bid.
This is called a “rebound check” and in ten years here with hundreds and hundreds of cats. I’ve seen it work twice and it was very evident the cat was overdosed. Kitty Boy does not look overdosed. He looks like he needs more insulin.
I would put him back on 5.5u at the next shot and make sure you get 3 tests each cycle including the preshot. For the other two tests in the a.m. cycle besides the preshot, please try and move the tests around so a +3 and +7 one day and a +2 and +6 another, etc. At night after the preshot, I’d grab a +2 and before bed.
Here is the spreadsheet of a cat I’ve been working with the caregiver. The CG did a rebound check and went from 4.5u to 0u and restarted at 0.5u. You can see how long it took us to get him back to a good dose which we had to do more slowly because he had totally stopped insulin for several cycles. The CG had data from last spring and the kitty was mostly in high numbers similar to Kitty Boy. I believe he dropped finally because the dose got to a good dose but the CG wasn’t testing enough to catch it and finally did catch it...then stopped insulin when the kitty just needed a lower dose. The depot drained and the kitty ended up in high numbers.
I know this has been confusing and you feel you’ve gotten different advice and I’m sorry about that. But I am on the same page with Wendy and a few other of the experienced members like Bron that the dose you had him on was not too high. He will need more insulin but first, get him back to 5.5u so we can get his dose stable and the depot stable and then get him on correct dose adjustments.
@Teresa & Buddy I appreciate your input to help here. I just want to add that some kitties, like Buddy and Kitty Boy, take some personalized help and while their SSs might look similar, the approach we take might not be. It’s good to share what you went through but I wouldn’t suggest copy that dosing but, instead, an experienced member should help with the suggestions on dose increases.

Again, it’s great to share what worked with Buddy but it might not work the same with Kitty Boy.