Hi Nicole
I got your PM but I prefer to answer publicly whenever possible, if you don't mind.
I honestly rarely give dosing advice because it is not my forte. I have personally managed only two cats, one of whom had such various and severe medical conditions that he was totally unique, and the other I did my best to keep out of DKA while I worked crazy hours and he spent his free time stalking my dog and beating everyone up. In-hospital I only see animals in crisis, so that data isn't helpful in most cases. So, with that caveat, I can only give the following more general advice :
With the second cat, when things were making no sense, numbers-wise, I buckled down and did my best to feed him at set times and give his shots at set times, as close to the time that I reasonably could, and feed him the same flavor/brand of food and the same quantity, and regulate the treat schedule too. I was unable to keep him more restrained in teh house, to reduce his stress, but this would probably have helped too. This doesn't mean you have to do this forever, but limiting as many other factors as possible can only help clarify things. Also, as long as your cat isn't in DKA or just out of it, I would try to stick to the same dose for a few days, gritting your teeth over the bumps in the road. I know a sliding scale may be in your future, but for now --again, to try to un-muddy the waters-- try to hold tight on the same dose, now that you're giving it a shot.
I know that's more practical/general than specific, but hope it helps. You may also want to post to Health to appeal to those with more experience with PZI. There are a lot of "old timers" who used it for years.
Take care
jess