@Lily123 may I ask what meter do you use and what is the process for "informing" the device about the types of insulin you are using?
Also, do you 'ask' the meter what correction you can take or do you suggest what you think the correction needs to be and it corrects your suggestion if you have too much insulin already on board?
Have you previously defined what your optimum target is? Presumably the meter has a generic formula for the life of each type of insulin and if that is so does the meter handbook (or online) tell you what assumptions it has made for your insulins? Or are you able to inform it about how your body is responding to that particular insulin (or does it have the equivalent of simple artificial intelligence)?
I'm curious about how this all works. I'm MDI and calc my boluses, calc my corrections and apply my own factor for reduction when I'm 'active'. I don't do formal exercise, ie go to a gym or similar, but I try to spend a decent amount of time doing 'jobs' or walking, which I call moderate activity; sometimes high activity if digging in the garden for a while.