Good Morning, LIL and Kitten ~
"I think I was walking around aimlessly for a bit when I got home out of sleepiness" -- Hey, LIL, been there, done that

. You're really starting to gather some good test data on Kitten to give you a better idea of how he's responding to different doses of Lantus. I think you're doing a great job!
You know, those higher flatter curve days can be frustrating but also give you a breather, too, after worrying about lower numbers. And curves like that are fairly typical in the early months of Lantus treatment. You'll have a day or night in Kitten's case with lower numbers than he's used to, like those blues he's been getting, and then higher rebound or bounce numbers the next day. Bounce can take up to 72 hours to clear...ECID (Every Cat Is Different).
From what I've learned about Lantus, LIL, often if you see longer, more extended duration than normal with a dose, it can mean too much insulin. But in Kitten's case, as Gayle's mentioned, he could just have late nadirs and be a cat that tends to go lower at night. I'm leaning toward a bit too much insulin and that it might be better for you to go back to the 1.50U dose for a while to see how Kitten responds. Let's see what Kitten does this morning though, LIL. Depending on his numbers, what I would do is hold the 1.75U dose for today, giving him 6 cycles/shots at that dose, and then reduce to 1.50U tomorrow morning. However, if he's gone low again overnight, then reduce to 1.50U today. Maybe Gayle will stop in to give some input on this, too, LIL.
Hope you have a lovely day today, LIL.
Eva