Hi, interesting thread! I hope the OP is a little happier with their routine now as this thread was started in Jan. I'm on different basal so have a slightly different experience.
I started taking levemir once a day when I was diagnosed. This worked for about 12 years but I then started noticing my blood glucose levels were increasing roughly 20 hrs after my daily levemir dose. This got down to about 18hrs eventually and after a discussion with my clinic I tried splitting the dose. This still works for me now.
I hadn't realised your reponse to the same insulin might change over time, so thought I'd post in case others hadn't realised this either. Libre/dexcom can massively help you spot these trends over time. Many have even tried different insulins after discussing this with their diabetes team which has worked for them.
I now take a smaller levemir dose in the evening, then a larger one when I wake up. This seems to be working well for me, though I do regularly tweak the doses. I often don't eat breakfast so only have 2 other injections a day for lunch/dinner. Have to say the simplicity of the libre and just injecting before meals makes me feel like I can forget about having diabetes. Don't get me wrong, I've been irritated in the past, but seem to be in such a routine that I don't find 4-5 injections a day a problem. I usually only have to use correction doses when I guess carbs if eating out/at a friend's.
I eat under 100g carbs a day, often much less, just because that is the diet I've always preferred (have never tried to eat low carb on purpose) but have never noticed needing to inject for protein for meals with no carbs. I assume this is because I ususally have carbs with at least one meal a day?
Whenever my bloods creep up or down I do tend to find a tweak in my basal stops this. I can often easily see this as I don't eat breakfast, so this tells me if my basal is right from dinner-lunch. Obviously not saying others should skip meals, but basal testing is useful. Hope you've been able to sort something with your diabetes team.