Rebound is frustrating b/c we don't seem to have terminology that really clarifies. I tend to think of it as:
Somogyi rebound = legit rebound due to either truly dangerous low #s, or sharp drops that cause the body to go into protection mode.
Panicky liver rebound = non-legit rebound, where the liver freaks out due to #s it is not used to, so a nice day in blues for instance, followed by a black # at the end, though there was no sharp drop and nowhere close to truly low #s.
I agree with Gator that Squamee does not have a history of panicky liver, so it would seem weird if it came up now, though of course it's possible. From what I have read something like 3 solid days in high #s is enough to cause their body to start adjusting to that level and pancreas to go to sleep, so that can mean when you get back to blue #s, wonky things will result.
I wonder if she is maybe very sensitive to the drops? Some cats seem to react to big drops more than others, it is possible to get rebound from that. It seems like she nadirs early, some of those +4 good #s followed by a higher +6 throw me off a bit, it is so different from Bix's pattern, which is typically a continued drop from +4 down to a nadir around +6. Of course some cats do nadir that early, but it makes me wonder if she is reacting to the early drop and the rise by +6 is the early stage of a rebound reaction? Just speculating/brainstorming here, I really don't know. You could compare her patterns now to her patterns last go-round, but I think you were on PZI Vet then, and ProZinc now? So the differences could be insulin-related, hard to say for sure. It looks like on the ProZinc she has had some nadirs later than +4, so it's possible the higher +6s are a reaction to the drop by +4.
If you are inclined, and she is showing no signs of ketones, you might try easing off the dose a little to try to flatten the curve some, or sometimes people have success with feeding something around +3/+4 to balance the insulin and soften the curve, but of course that's not really an option with her. Don't mean to contradict any dosing advice you are getting already, as I haven't been following closely.
If it were me, I would probably experiment with lowering the dose a teeny bit and see if things even out better, and if the #s are running higher, I might try shooting at +10 or +11 to head off the really high #s. It can be tricky if you get in a pattern of going from those 500s down to blues and back up - even if the dose isn't too high from one standpoint, those big swings can cause their own problems, and sometimes a lower dose (even if you have to shoot a bit earlier due to shorter duration), can help by flattening it out. You have to be careful of course to be sure you aren't simply underdosing though... it's tricky. What a pain she is throwing those high #s, argh!!! In my experience with Bix, usually if I back off the dose a bit I can tell pretty fast if that was the right move (sometimes then he'll get a perfect nadir, rather than running high at a +6 or so), vs. sometimes he'll just go higher overall and then I know it was a mistake to reduce.
