Am no medic, but have your docs considered a thyroid issue?
I was being investigated for a thyroid problem when I was diagnosed with type 1.. LADA…I still have high cholesterol, despite dutifully swallowing the statins. Still being investigated for a thyroid issue and had full liver exploration done along the way!
There is some research somewhere on ‘normal’ glucose levels in peeps without DM, they fitted them with CGM’s and as I recall a rise from 5.4 to 7 wasn’t unusual, especially after eating and from my own experience sometimes exercise can shoot BS upwards, as I understand from a liver dump. Sorry haven’t got the link For the CGM research.
Have seen non DM people self funding a CGM for a couple of weeks to see what is going on.