I have been on Nestle Resource 2.0 for over two years and it helped me put 20 pounds back on. It is 2 calories per ml compared to 1.5 that you are doing now. Five boxes per day gives almost 2500 calories. Its expensive but there is free delivery in the US.
I also do two bottles of liquid yogurt every day to help digestion and add a few calories.
I am going to ask when I attend clinic in Macon what other formula I can be on. I am on 4 cans a day, they want me on 5. They put me on it at Mayo..because it had fiber.