I am not a doctor, but have been taught by my endocrinologist how to adjust my insulin:carb ratio.
1) Track everything - keep a log book on exactly how many carbs you are eating, how much insulin you are taking, amount of exercise that day, and blood sugars before you eat and 2 hours after you eat.
2) Eat foods that are easy to count carbohydrates.
3) Show a someone close to you your logbook and get an outside opinion on the changes that need to be made. I am willing to help! Just ask.