This is an overused phrase. It's overheard when people discuss theirs or their child’s diabetes. It’s classically said in reference to a static insulin dose, insulin basal rate setting, or insulin/carb dosing algorithm.
‘Fine tuning’ is a metaphor referring to the act of adjusting an analog radio channel to the best possible frequency to receive the clearest audio signal from a particular station. I used to be an amateur radio operator and recall many hours adjusting the tuning on my receiver to catch a radio signal from the other side of the world.
In my opinion, fine tuning is an incomplete metaphor for ma