Always great to hear from people who are having success with it, as people who have problems tend to be more vocal about it and give the impression it sucks for everyone—or most people—which isn’t true. So I always try to mention this when I’m griping about my experience.
The biggest problem for me was overnight highs, rather than lows as you’ve experienced, which were caused by the sensor persistently registering well below my actual BG at night, depriving auto mode of the information it needed to compensate for rising BGs due to dawn phenomenon. I just couldn’t figure out any way to fix that, even getting up at 4a.m. and doing a calibration, because DP is gradual and by the time it’s really kicking in it’s too late for the pump to get ahead of it. In general I think it’s easier to convince the algorithm to be less aggressive, since that seems to be its predilection to begin with. Trying to get it to be more aggressive runs up against limitations that are hard-wired in to prevent people from hurting themselves. A real frustration to those who are experienced in monitoring BG and achieving tight control to begin with.