In case this helps anyone else I’m posting this here. YDMV.
[Background: My basal rates have all been set during careful fasting tests. And confirmed with multiple fasting tests.
I am moderate to high carb. On more cantankerous days, I’ll go lower carb to try to wrestle some control out of the day.]
I have started using an extra 10% basal during “eating hours” to dampen post meal spikes and support my body’s evidently different insulin needs in an eating state vs a fasting state.
I remove the extra basal about an hour before bed when I’m going into a fasting state.
If I use my fasting basal rates all day long, my meal boluses never work out. I go high and stay. Or I tank early and feed the drop. It’s just terribly mismatched no matter what I try.
If I use my extra basal (that’s needed during eating hours) overnight during fasting, I inevitably tank.
So far this is helping me out quite a bit. And this is of course it’s own thing separate from varying levels of insulin sensitivity depending on what my hormones are doing on that given day.