I use humalog. If I am low at 2 hrs after a meal, I am probably on the road to a low. Walsh in “Using Insulin” suggests that 20% of Humalog/Novolog is used up in each hour after injection. That means that a low at 2hrs is being backed up by 60% of my meal bolus is waiting in the wings to hit me. If I had a large protein or fat meal, I might be ok, I’ll often take 3-5 hours to digest some major steak. But for a pretty fast digesting meal, all that yummy glucose is probably far gone.
In the future, hopefully all pumps will support a carb correction feature allowing you to enter your blood sugar and computing the number of carbs you need to eat to “cover” the insulin still on board. At this time, I believe most pumps will only factor this in as part of computing a carb bolus.