Note: I have no experience running C-IQ untethered, but if your basal rate is zero, C-IQ CAN’T help you prevent lows, because it does that by dialing back or completely stopping your basal rate. If basal is zero, there is nothing to slow or stop.
It also determines a maximum basal rate that it will allow/add. I can’t quite remember how that is calculated … but I’ve got a vague recollection that it includes your total daily insulin usage and your weight. In fact, I don’t recall actually seeing how that maximum is calculated or whether you can display it … but it would be nice to know.
Finally, if C-IQ predicts that your reading will go above 180 mg/dL, it will add a bolus … but only 60% of what it thinks you need and no more than once per hour. So, for safety reasons, the automatic bolus is actually weaker than many would like.
Best of luck adapting to C-IQ.