You may try low carb eating, which is very helpful for blood sugar management.
Type 1 grit is a group with great support and information on low carb eating for
diabetes management. Look also into Dr. Richard Bernstein's Diabetes SOlutions book and Diabetes University (Utube), which has great and useful series of lectures on managing blood sugars.
A CGM (continuous glucose monitoring device) can also be very useful, though frequent finger prick testing is also ok.