I've been trying to correct problems with alternating extreme highs and lows since the school year started (T1D is my 6 year old daughter). I've managed to blunt the extremes, but we're still getting a yo-yo effect. Does anyone have any ideas about the next step to try based on the data from today below? Breakfast eating soon was 45 minutes prior to meal and prebolus of about 10 minutes prior. BG rose after breakfast, peaked above range about 1.5 hours after breakfast, and then started to drop too fast. School snack is at 9:30 am. I programmed eating soon to start at 8:45 am, but had to abort because bg was dropping too fast. This snack resulted in another high, peaking about 1 hour after snack, and then a drop that started to accelerate by lunch time at 11:45 am. I did let a 45 minutes eating soon run prior to lunch and prebolus was 15 minutes prior to eating. This resulted in a fairly flat, in-range, post-lunch bg beginning 1 hour after lunch bolus and lasting for about 1 hour. This was followed by a precipitous drop in bg (starting about 2 hours post-bolus). I have a couple of theories about what's going on: (1) could be mostly a timing issue (e.g., need to do eating soon earlier to prevent high and then subsequent crash); (2) could be a combination of timing and too low CR (e.g., need to do eating soon earlier and also make CR higher); (3) could be a DIA issue (e.g., current DIA of 3 should be set to 4 or higher to account for longer insulin action). Or maybe it's something else entirely (probably this!) Any ideas?