This is tough because you say you eat loads, could you list what one day of food for you looks like?
Mine is a salmon salad... About 11g carbs with stuffed peppers, 6 olives now, an avocado, lettuce, onion, tomatoes, cucumber and a homemade olive oil ninerette dressing. I then have walnuts and 2g of dark choc. If hubby is around I may have a torte bar 11-15g carb as well. When I've been working all day I may swop the torte bar for a homemade small bowl of fruit salad. This is my main type of meal pretty much everyday come sun or rain. I may vary with other fish and cut the pudding out, I may have fishcakes, corned beef etc. tomorrow will be meatballs and home made sauce and veg...
When I lost weight I had added in more dairy (double cream and cheese to my meal). If I want to gain a few lb I just add in a slice of bread each day and guaranteed by the end of a week I will have put 2lb on.
I am on a pump so it is easier for me to have just one meal a day.. Although I have done this for at least 95% of the last 30 years of being diabetic!!
I ask what your hba1c is because you must balance your insulin too....a hba1c of 8+ is indicating that you are running too high. Which you know. As you have cut the carbs like a few people T1's find their basal rates/injections can need changing to give slightly more...