Based on what I'm seeing I would get a nadir test in on this dose and if it is not around 120 or lower (or wonky, like pink), I would actually raise. I think it is mostly irrelevant if the PSs are mid to high yellow vs. pink - they are all too high, and unless the nadirs are good, it means you aren't getting results.
The idea with a dose lowering is that if the dose was too high, you will see near immediate drops into blues & greens - like you saw when you dropped to 1.6 and then again when you dropped to 1.4. You haven't actually seen that (at least based on the data you have) on 1u, which leads me to think the dose is too low. B/c you got that one low 200s PS on the first cycle of 1u I thought it deserved a chance, but I'm not seeing it at this point. Would be nice to have a nadir check though - could be blue, who knows. You can't really judge from PSs unless you have a ton of data and a predictable cat, and even then they can throw curve balls.
So, that's my voice of dissent. If you aren't sure, I would say fine, drop the dose and prove to yourself it's too low, so you can raise back up with confidence. Please test regularly for ketones though, and watch for signs of symptoms getting worse. If he isn't eating well, or the peeing/drinking stuff goes up, I would raise up immediately. I'm happy to be proved wrong, but am worried about his insulin needs not being met. I would say if you drop to 0.5 and get immediate improved results, great. But some cats never zoom up to pinks and reds, they just hang in yellows, so if you aren't seeing blues & greens, the dose reduction is not the answer.
