I've been eating low carb for at least 7 years now. I don't count carbs, I just avoid them most of the time (particularly grains, potato, corn, sugars, most fruits).
I have excellent Hba1c (last 1 was 5), and use mainly basal insulin.
I am not slim, but that has always been a battle for me.
I also use intermittent fasting. I am about to start the 5-2 plan next week (5 days normal low carb eating, 2 days low calorie eating) to try to lose some of the weight that loves me so much.