A high number usually isn't an emergency, especially if you think you gave a fur shot the previous cycle. If the insulin didn't get in, it makes sense that you'd see high numbers. You can take the 911 icon off since this isn't a life threatening situation.
Let me make a couple of suggestions. You would have a better sense of whether you did, in fact, give a fur shot if you were getting routine tests during the PM cycle. We strongly encourage getting at least a "before bed" test every night. Lantus dosing is based on the nadir. You're already seeing blue numbers during the day. For many cats, numbers run lower at night. If you don't test during the PM cycle, you could be missing dose reductions. In addition, you're missing half of your data. It makes if very hard to make good decisions about dosage if you don't have the full picture.
I also don't thing Gobbles is at a point where fattening the dose is necessary. Typically, we fatten or skinny a dose when you're getting close to a good dose. Your kitty isn't quite there yet. I'd encourage you to read through the
Lantus dosing protocol. Doses are typically adjusted in 0.25u increments.
It's possible that Gobbles is picking at his food because being in the 400s doesn't feel good. I'd keep an eye on him to make sure this doesn't reflect some other issue. Does he have any health issues or a history of developing ketones? You may want to put together a
Profile so the relevant info on your kitty is easily accessed by everyone and you don't have to keep telling his story.
As for testing, I'd test 2 - 3 hours after your AMPS.