The dose is looking too low to me. My suspicion is that he is one of those kitties that doesn't zoom on his own, but basically he is not seeing greens, it just looks to me like you are getting closer and closer to basically seeing what his numbers look like if you don't give him insulin at all. Since they are diabetic numbers, I think you may be stuck with a trade-off where if you push him to the greens, you end up seeing some higher PSs in consequence. Of course the black and red PSs you saw a while back are not an option, but I wouldn't worry too much about higher yellow and low pink PSs. If you can get to a dose where you see green nadirs, I would just tolerate the higher PSs (provided he does not see a steep drop). They are either something that will settle down over time, or if not, you could consider shooting more often than 12/12, or switching to a longer-acting insulin.
Of course he is tricky b/c you have never seen greens, and it's hard to know what dose might get him there. If it were me, I would probably go to 1.2 and stay there for a couple days before raising further. I might try 1u as an intermediate step, not b/c I think that will be a good dose, but just not to jump the dose too much all at once. I'm kind of on the fence on that one, 1u vs. 1.2.
How is he acting?
