I find FitDay's calculations of what you can eat confusing, so what I do is look at the bottom line for each day. I compare the Food tab calories to the Activity tab calories. To lose a pound a week, there should be 500 calories more burned than eaten (and I do log nightly sleep as an activity) because there are 3500 calories in a pound, 500 X 7 days = 3500 a week. To lose 2 pounds a week, the daily activity minus food difference should be 1000.
I suppose you could, in theory, eat those 300 more calories, or you could choose not to, to keep ahead of the curve.
There really is no one perfect breakdown of carbs, fat, and protein you should strive for. We all do it differently. Some folks on here are doing low carb diets, some have had success with extremely low fat, some go for more of a balance. My suggestion would be to try some different ways and see which one causes your body to give up some of the weight. Whatever you choose, make sure it's something you can live with as a lifestyle change, because if you don't like it, you won't stick with it.