@Jen, I really wonder if this is not the cause for your recent difficult times.
We have been having a horrendous time in the past 2 months, which I am thinking are primarily due to a lot of exercise but with a lot of variability on the exercise, the time of the day, the amount etc. I am realizing that the amount of exercise variability affects even all of our other ratios (ICR, CF etc.), so it’s not only basal that is affected (for us) but also meal bolus dosing, corrections etc.
I am not 100% sure of what I am attributing the source of our troubles to—but if I am right, possibly this could be your problem too?