When you fiddle with basal, remember that you need 2-3 days to know where it will settle. That means you have to keep it at one dose for a couple days to be able, through testing, to see where it keeps you. It means you have to refrain from eating for long enough to see where you are 3-4 hours after a bolus. No fair eating before then!!! Remember your CGM is 15 minutes behind your blood glucose.
I don’t know if you’ve got your basal in one dose or two, but I would see where it is at different times of the day and night, always 3-4 hours after a meal - even if it means missing a meal, and if you want to do it right, MISS the meal and see where you stay. Miss one meal on Day 1, Miss the next meal on Day 2; miss the third meal on Day 3. If you start going low, you have too high a basal.
The rule is change by only one unit if you are taking less than 10 units. Change by two units if you are taking 10 units or more.
If you find that you are peaking with your basal (e.g., going low 4-7 hours after taking the dose) go to two doses, generally 2/3 for 16 daylight hours and 1/3 or less for the 8 hours of night time. Once you have a basal that keeps you even around the clock, then you can fiddle with boluses if needed.
Note that if you go low, you apparently need 7-8 grams of glucose to bring you up 35-40 mm/dL. Use 8 grams and test in 15 min. Give more in 15 min. if needed. Use glucose tabs when testing this out or when endeavoring to cut out swings. They act immediately in the mouth with no digestion needed. I know, Marps, you’re experienced. But a lot of people don’t use glucose tabs, so I’m repeating it when you want to get rid of swings and you’re setting basals and boluses, only use glucose tabs and you won’t have to wait much.
Hope you tell us how it works out. - And keep your carbs when you do eat, small enough that you’ve got control of what they’re doing! At least for awhile.
No one should have to eat