The problem with being on 2 shots of 25/75 a day is you have to be exactly consistent with amount carbs you take in and the amount of exercise you do. With 2 shots a day you aren't really allowed to deviate from carbs and exercise. When you add in stress, sickness, or high blood sugar that needs to be corrected, 2 shots a day just isn't going to cut it. I really wish you would listen to us and get on MDI with lantus or levimer for a 'base' (base = basal insulin.) insulin and humalog or novorapid for meals/corrections (Bolus). Or go on a pump. The pump really would be your best option as it can teach you alot and handle the computations to get you running healthy. Right now your numbers are extremely high as you know, and will stunt your growth and cause havoc on your organs. This is also why you are probably so thin.
Since you insist on using what is now considered an ancient method to treat your type 1 diabetes you are going to be very constricted.
You need to count how many carbs you are taking in a day and with each meal. You can find carb amounts on the sides of food packages. Eventually you will be able to eye ball foods and guestimate accurately how many grams of carbs are in a meal.
There is some trial and error here. Test right before you eat and approximatly 2-3 hours after each meal. Take note of the amount of carbs you eat. Once you fine tune the amount of insulin you are taking to the amount of carbs you are eating in each meal to the amount of exercise you do you must stick to that schedule exactly.
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You must do this with every meal and stick rigidly to it
Lets say you test and are 4.3 before breakfast, consume 35g of carbs at breakfast and 2.5 hours later you test and are 6.0. 35g of carbs then are what you need to eat everyday at breakfast. You then need to do this with every other meal you eat.
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If you go on MDI or a pump you can fluctuate how many grams of carbs you take in, or if you choose to you can even skip meals. You can't do that on 2 shots of 75/25. You also can't correct high BGL's due to a bad carb guesstimate, stress, injury or sickness.
Obviously I can't cover everything and didn't want to overwhelm you, with things like types of carbs, protien, fat. I am sure many can help chime in on this to help you too.
If you go on diabuddies.com and create a diagrid you can paste in your resuts like this:
Which will help us help you.