Hope you're having a good day Molly! I know there is a lot of information here - and you'll get a bit overwhelmed at first. But just keep asking questions and you'll get there!
Excellent job posting your title, avatar and SS today!!
You are doing a great job on the daytime tests for them both but with no nighttime tests at all, you are missing half your data. Cats tend to go lower at night and then can bounce up back high by AMPS.
I’d urge you to get, besides the PMPS, a +2 and a before bed test for each of them. That would help us see where they are headed.