I got to thinking (uh oh :roll: ) and wanted to clarify a little. I can't say what you should do for Kitty, but I can tell you what *I* would aim for. And this applies to a lot of other kitties too:
I would raise in 0.2 increments every 3rd day until I got to solid blues and greens. If I started seeing patterns that suggested I couldn't continue down that road - consistent good nadirs but really high PSs, nadirs that are too low, weird stuff like clear inverse curves (not just maybes or flattish ones), then I would try a different insulin.
With Bix, I putzed around with uncertainty & fear & all for a while, and when I finally got systematic about it and stuck with that plan, he was regulated within 2 weeks. I had resolved I would give it a month and if he was not regulated by then, I would switch insulins. Of course he only needed about 1.8 to get regulated, so of course that is a little quicker than a higher dose kitty.
But my point is that I am concerned we have collectively gotten overly conservative here, and are doing kitties a disservice by not pushing more for more insulin (in most cases, not all). I know when I got here I was pushed daily to raise Bix's dose, and whenever I got nervous about that people talked me through it. No one took a "well that's ok, it's up to you" sort of approach, which I tend to do. I think as an advice giver it is hard to find the balance between respecting someone's right to do what they want, and at the same time pushing them in a helpful way to get their cat regulated. When we see a number of cats who have been here a few weeks/months now and are not regulated, it definitely concerns me that those of us who are giving advice aren't striking the right balance. We typically push pretty hard to get someone home testing and to switch to LC foods, but we don't push very hard on insulin increases.
So basically for Kitty, I would say her #s are generally too high, and especially with a ketone history, that is a risky situation. I would tend to say she needs more insulin. If it turns out (and I don't think it's clear yet) that she is getting overly steep drops, then I would try a different insulin, or a different shooting strategy, like TID or As Needed dosing. So I think that's the bottom line. I certainly respect too that there are other factors, like it's not practical for many people to raise doses every 3rd day (I wasn't working at the time, so I could do that for Bix), or their goals may not be the same as mine, etc. (See there, I wimped out already! I just don't like pushing people!!!!)