Sorry I have no advice for you but I'm in your shoes. Despite starting insulin I haven't had a fasting # below 95 (what my dr wants)... All I can say is once your fasting is under control the rest should fall in line. That's why we had to start insulin. My fasting was starting to effect my breakfast where before it wasn't :(
I've tried eating my full 30g of carbs at bedtime, way less than that, no carb, and no snack. Nothing changed my numbers. Everyone is different and be more difficult or easier to control.