But what was it at 1pm before you had your pud cheese cake, paired reading are much more informative as to what might
One of the complicating things about our bodies is that our natural resistance to insulin (your own or my injected insulin) changes at different times of the day and also changes depending on how low or high one's BG is. Most of us get an increase in resistance when our BG is higher - but that's not a definitive rule.
So if you woke with a BG at 6 your body might naturally cope with extra carbs from breakfast from your own insulin release, whereas it might not cope if your BG was 12 - because of the possible natural increase of insulin resistance. Later in the day your natural resistance might lessen and starting closer to 12 your natural insulin might cope a little better. Or it might not.
So getting an understanding of how you should expect your BG to respond needs regular routines (logged); and clear comparative records (particularly fps just before a meal and consistently at the 2 hr point). Then with a series of results it becomes a little easier to draw a conclusion AND the confusion is lessened. None of this is easy. If it were easy these sort of questions would not occur.
If a series of results from similar routines simply does not produce an identifiable trend then it becomes easier to explain in terms of your pancreas not producing insulin in any sort of consistent way - probably (certainly possibly) arising from your earlier panc'y damage. At the very least if your various "exploratory" measures doesn't get you to consistent BGs somewhere around the 5-7 zone then there seems to my non-medical mind a strong necessity to get you onto a full MDI routine and bring some stability to your BG 24 hrs a day. An overnight change to MDI won't bring an instant stability; it will need time (months probably) to find the right doses in relation to meals being eaten.
Again, none of this is easy - but is doable and your endeavours and questions in the last month leave me feeling that YOU can do this. The first step is wanting to take care of yourself and you've made that start.
A couple of questions that has come to my mind in reading your response, yes I’m modifying my diet and trying to increase fluid intake however, would this suggest that whatever I’m doing isn’t enough and should I still be looking at 3c?