I definitely agree with Nancy's advice that you should worry less!

I don't think anyone knows for sure, we are all just doing our best to look at the data, the symptoms (or lack of), and the overall picture and give you our best ideas what is going on. I don't know for sure, but I agree with you, I don't see how the raise from a .5 to a fat .5 and a low PS to a high PS could be triggering rebound.
I do think there is a mystery we are seeing with ProZinc where it seems like they fight the dose a lot, and I'm not sure what to make of that. It seems like there are a lot of cats right now where dose raises simply aren't working, and if you lower the dose you see some better numbers, but then they don't stick. I don't know if it's that with ProZinc you have to raise the dose past the resistance point to get to better numbers, or if there's some incredible level of finessing that it needs, or what it is, but I for one am finding it really frustrating! I can't speak for anyone else, but I would guess other people are experiencing the same frustration - just day after day with cats not getting good numbers, and whatever their peeps try it doesn't seem to come together. I don't know if it's the insulin, if the doses aren't right, or other factors in play, or maybe some combo of all of those, or ECID and it just looks like a global problem when it isn't.
When I see her #s go all high and icky all of a sudden and she was doing well and there are dose increases, my first reaction is "oh yeah, the dose is too high and she's fighting it". But then I think about how Bix at times needed dose increases, and I knew from experience with him that reducing the dose didn't help, he just flat out needed more insulin at times. And I think about how it has evolved day to day with Thumper, that her numbers went higher on a dose that had been working for days, so you raised a hair and then as you have gone along since then it has had every appearance to me that the numbers were going higher ahead of your dose raises, not the other way around.
So that's where I come around to feeling like it's probably a good idea to do a quick check on the dose to make sure it's not the case that she is SO sensitive she only wants .5 or something like that, and she is freaking out now at the increases. And a good idea then to raise back up quickly if she doesn't respond to that. IMO none of us know 100% what is going on, so you try things in the safest way you can, and gather data, and find out for sure. Ultimately with Bix when I had him in good numbers it was because I tried things and got data until I knew what worked and what didn't, not because I was able to look at his numbers and really know what was going on for sure (until the patterns repeated enough that it was predictable).
There are people with more experience than I have who may be able to look at the SS and know for sure what is going on, but for various reasons they all left the forum a long time ago. At the risk of offending everyone :mrgreen: we have kind of been the blind leading the blind here for a couple years now, and though a number of us have some good experience, mine at least pales in comparison to the people who taught me when I got here, for instance. So I think it's more of a support system and ideas forum here, than anyone really being able to tell you for sure what is going on and here's what you need to do (if even the super-experts can do that, I don't know).