Many times in my past I have experienced lowered basal rates leading to even lower glucose levels. It’s counterintuitive and is a bit unsettling.
This is the tactic I would use, too. You might start writing stuff down to help with your analysis later. You will find a balance point where your glucose levels stabilize. From my experience, I can only conclude that the act of taking less insulin leads to even less insulin resistance in many people.
This reminds me of what I call “basal lows,” a hard charging low glucose trend that resists treatment. I think it’s likely that your basal rates were set too high for you. The excess basal accumulates and persistently drives lows.
Our insulin needs can and do change, almost every day. I’m thinking that your insulin sensitivity went up and you needed less insulin. Continuing to infuse at the old basal rates was not appropriate for you. Give yourself credit for making this observation and taking action.
It’s tough aiming at a moving target. Your agility is what counts here and you are training the right treatment muscles. Good luck with managing this volatility. In me these kind of episodes are often caused by positive lifestyle habits like limiting carbs or getting better exercise. I think increasing insulin sensitivity is an asset, troubling as the process it creates is.