Great job. It takes a lot of dedication to make such dramatic changes and your A1c reflects your success. I think often, if you actually have T1(LADA) as an adult, you don't lose insulin production all at once, over time it degrades. So it is very common to be given the diagnosis of the more common T2 and only after treatment fails and things get bad is the diagnosis of T1(LADA) considered. In the case of your c-peptide, it is kinda inconclusive, although it is low, your BS at the time was only 75 mg/dl and a low insulin/c-peptide would be expected. The real confirmation of insulin deficiency comes when your BS is high (like > 150-200 mg/dl) and you have a low c-peptide. In my case, my c-peptide was 1.8 with a BS of 130 mg/dl, and my endo still considered it inconclusive.
You may be concerned about highs, but it could also be your perspective. If you are higher than 140 mg/dl 2 hours after a meal, then you might say you are high. Are you seeing readings at that level?