Ok, no, your not over thinking this!
The diet you are following sounds really good and the control you have is brilliant! Staying in normal levels range is the best treatment that I know of!
You are trying to make sense of all the new things that are happening to you.
The biggest problem all us hypoglycaemics have is we all have different food that we are intolerant to, my worst are potatoes, then wheat but I'm not gluten intolerant, I'm lactose intolerant too! The amount of refined or complex carbs are important, as is saturated fat of what your right balance of food is. This is why a food diary and a glucometer is the best tools you can use to make sense of how food affects your blood levels.
You will know if you come out of ketosis, or your blood glucose levels are going out of normal levels, again, I have never used ketones testing, just relied on my glucometer, the way I feel and my health improvements when I was at the same stage of finding out how to get a grip of my blood levels.
My endocrinologist wasn't bothered if I stayed slightly above normal or just above ketosis, he said that was a more natural state of how the endocrine system works.
But I just stay in normal levels, because I really believe that is how my body, (not my brain) wants me to.
It is a lot of things you have to do, and if you do come out of ketosis, then cut out all carbs, if you are like me, a good sleep should put you back into ketosis because of the overnight fast. If you feel a little rough, avoid the worst carbs, or fast, eat little, don't overeat. If fasting doesn't work, then only have a bite or two, cheese is a good option.
My personal choice it's a ham salad! It's fresh and not processed! The ham is roasted!
All my meat is not processed!
Make sure you are getting enough salt. Because you have cut out the processed foods, the amount of salt intake will probably drop a lot.
The other main thing is drink enough water!
A good tip if you like your coffee, is a fat bomb. Full fat cream ( because of the good fats and virtually no carbs) in your coffee is a good way to start your day.
Unless, you are intolerant to caffeine!
See how this works?
Potential landmines everywhere!
Keep asking, keep safe!