I love walking too, and I top up with carbs before and during my walk if needed. I use Dextro tablets or jelly babies or those little can of Coke sometimes. All good
🙂
With that 3.3 after your breakfast, I’d have treated that as a hypo (which it was) and have had Dextro or jelly babies. Then I’d have had some longer-lasting carbs eg a digestive biscuit or slice of bread or similar. Your after-lunch result looks good. You might want to aim to be slightly higher so you don’t drop too low eg somewhere in the 6s. Sometimes it’s easiest to just add a few grams of carbs if you can’t lower your insulin eg you could try an extra oatcake.
I just saw your banana question - nothing wrong with bananas at all, but what caught me out was that the carbs they give for a “medium banana” is actually what I’d call a blooming tiny banana

So I now tend to weigh my baby a a and work out the carbs that way. For other fruit like apples and oranges, I find the average size works fine. We must just have enormous bananas here! But yes, you can eat them. Nothing is off-limits. The only thing I was told to avoid was full sugar drinks except if treating a hypo. I eat bread, cereal, pasta, rice, cakes, desserts, etc etc. I just watch my portions and choose wisely - as well as ‘being my own pancreas’ and working out the carbs and insulin.
Don’t let Type 1 spoil your enjoyment of food. I found the early days hard because it did affect the way I looked at food and my decisions about what to eat, but once you get your head round things, you can enjoy your food just like anyone else. Type 1 is an irritating passenger in our car - it’s not the driver. It does need thought but it shouldn’t restrict us.