I've been a T1 for 25+ years.
For the last few years I've managed to stay in my range 6-10. I carb count and have had a 1-4 during day, and 1-2 evening ratio and this has pretty much worked keeping me in the green on Libre.
Since the beginning of month, my A1c has shot up to 8.4 from 6.5. Now...