I am having a bit of difficulty actually hitting my goals. This would be an exaggeration of what I eat

and the recipes for the spicy salad and taco lasagna


I have been using Slim fast for 2 meals a day and keep ending up 1100 - 1500 shy so today I decided to see what would happen if I just ate what I wanted to. so Imagine my surprise when I still came up nearly a 1000 shy of my goals.
Can someone offer any suggestions, or is it ok to be that far off?
Note: I stand 6,3 weight 385lbs and not even the doctors believe it and insist on reweighing me to make sure at every visit, as they are certain I cant possibly weight over 300-325.