I counted around 20 recent doses of 3 units, with an awful lot of red, which can't feel good. IMO she's given it a fair test, and its time to bump. IMO the nadir is the most important number, and they aren't even close to pretty, almost all red and even black.
I hope you can test for ketones soon. Its ok to test a fresh puddle in the LB if you cant catch him while he's going.
Also, I know you are used to seeing red, and yellow is scary, but when you saw the 268, you should not have fed and waited if that was +12, you should go ahead and shoot, anything over 200. We need to catch some momentum. On Prozinc you can be pretty certain that he will continue to rise after +8 through +2 of the next dose.
and remember, you have the power- to feed HC food anytime he ever gets below about 70
And I don't see a bounce, I just see what looks like not enough insulin. I'll look again, but I don't think he ever went low enough to cause a bounce, even for a cat used to high numbers.
Whats the allergy? could it be to gluten? or fleas? Is he an outside kitty? fall pollen already?
In general, the FF flavors with gravy are higher carbs and the pates are better.