"I'm not sure my vet would admit to not knowing something"
Then your vet has problems. I am a computer security expert. Yet with co-employees and managers, I will readily admit when I don't know something. Then I'll read about it, if it is pertinent.
Acro is not well taught at vet schools. Heck, diabetes information seems to be missing from many of the vets we have heard about on this forum. Anyhow.
You are doing good. However we recommend daily tests for pre-shots. That is the only way you will be able to tame the Acro beast. Nadir testing (6hr to 8hr) testing is also very instrumental to show how effective the dose is. Your kitteh may get back to 400 or 500 at that AMPS or PMPS times but only the nadir test will show if the insulin drove the BG down.
Since Rufus is at 5.0, you can raise in 10% increments every 7th dose until you see effective nadirs. Rufus really needs to get out of the high numbers. Otherwise neuropathy will occur very soon.