I’m on the Medtronic 670G, which in Auto Mode seems to be much more conservative on corrections so it brings me down more slowly. On every previous pump, I would feel terrible when I hit 300, always get exasperated and inject or over correct, and then have to deal with the rebound low. Our bodies are complicated and insulin activation varies day to day. IMHO, it much safer to do it slowly and avoid insulin stacking with a rebound low.
Whenever I go above 200 or so, it’s because my infusion site needs changing or it’s just been changed and the insulin is taking its sweet time getting into the bloodstream. At 300, I’ll switch back to manual mode, inject 2 units, and do a correction with the new infusion site. Injections start to work within 20 minutes, insulin through the new infusion site takes 1.5 hours to work. But I have to discipline myself to not over-react and be patient.
I haven’t yet had to deal with being sick with this new pump yet. Supposedly, it should automatically give me more insulin. If not, I’ll just flip it back to manual and do my “sick temp basal”.