Hello livesey!
Just wondering if you are coming out of the honeymoon period as your insulin requirements are increasing along with increased bg. Some type 1's insulin producing beta cells recover after diagnosis and this is why you injected smaller amounts of insulin thus far, the honeymoon period can last months or even years in some cases but no two patients are the same so this may be a possibility with yourself.
Your best bet would be to get in touch with your diabetes nurse and discuss your control, keep a record of the carbs you eat with every meal, insulin dose and your postprandial bg readings so the nurse can advise further, it might be that your basal insulin may need to be increased also but just wait until you see the nurse.
Nigel