I know some people don’t agree with this but I believe, given the same level of blood glucose control, less insulin is better than more. Good job on your Fiasp insulin adjustments.
I took a look a the Fiasp package insert to see what it said about insulin duration. Looks like they show insulin duration at 5-7 hours depending on how many units/kilogram of body weight that you dose. Here is a snap-shot of their findings for their study group.
I don’t use Fiasp, but I have increased my Apidra duration of insulin action setting up to 6 hours influenced by this NIH John Walsh study entitled Confusion Regarding the Duration of Insulin Action. I had previously used settings as low as three hours.
The people who maintain the code that runs Loop, an automated insulin delivery system, recommended setting this option to 6 hours. I think my overall control is improved with this setting change as I don’t get many blood glucose surprises several hours after a meal.
Having said all that, I’m a firm believer in the saying, “what works, works.” We do not all align with the norm of the people studied to produce the insulin duration graphs.