claymic
When I started out I did the same kind of thing you're doing so I made a target number of carbs / day and tried my best to stick to it. That's fine but recognise it isn't a diet you're doing its a means of controlling your blood sugars. These are two completely different things. So if you get hungry after your main meal then do one of two things, either eat more meat and veg in your main meal to fill you up or munch on something like cheese and celery later on.
At the stage you are at I didn't give one jot what or how much I ate so long as it didn't take me above my daily target. If you're hungry last thing go cook an omlette or have a good fry up of bacon and eggs but don't eat four slices of bread as that's self defeating!
You can get the fat, protein, carb balance sorted out once your BG's are under control.
All the best