Agreed! I don't think Casper will ever need 1U, when the ER did 1U before, we had nothing but trouble and he couldn't get out of the hospital. I do feel the 0.75U is the correct dose.
I know Elise said this but it bears repeating: try not to look back at what happened to Casper on a certain dose. What happened in the past is not indicative of what will happen in the future if he does end up back on 1u or more. Whether or not to increase is based on how low the dose takes the cat (nadir) currently.
Especially in the beginning when we are new to the sugar dance, it can be very difficult to hold onto a dose for kitty because we're trying to figure out the best times to test (looks like +2 for Casper to start) and what to feed to keep our cats' numbers steady. You're still figuring this out with Casper. The learning curve is steep.
Have you had a chance to look at other kitties' spreadsheets? Elise suggested Gideon's. Look at others. It can really give you a good sense of how insulin needs can change. Have a look at
Butters' 2020 US spreadsheet : She started on 1.5u of lantus in early June, went down to .25u, up to 1.75u, and back down to 1u, all in four months.
Now look at her same spreadsheet from October - December. In two months, she went from .5u up to 4.25u. This is most likely because she developed some glucose toxicity after she wasn't given as much insulin as she needed to keep her numbers down. But once she hit that magical dose, she has been coming down the dosing ladder from December onwards (
2021 spreadsheet). She is currently on 1.75u.
In the beginning, I also struggled to catch Butters' drops and feed her numbers properly. I leaned on Elise and others here hard for advice on how to feed and when to test. You can do the same. But please be open to Casper's insulin needs changing.
All that said, I still think you are doing a great job with Casper. But this is super tricky and it really does take a village to get these kitties better regulated.