IMO, the best ways to control hunger are fiber, protein, and healthy fats, as they "burn off" much slower. If possible, try to have snacks that combine these, like cheese and whole grain crackers, peanut butter on an apple, some nuts, something like that. Just as an example, switch to Kashi Go Lean, which has a lot of protein and fiber, over the flakes, and you may notice a difference.
I believe that the calorie deficit is the most important thing, but I also feel that where the calories come from is also important. I can eat the same number of calories seven days in a row but depending on the proportion in my pie chart, I can feel really hungry or completely satisfied, and everywhere in between. Trial and error will show what works for you...hang in there and you will figure it out!
And now that you don't have to be perfect, you can be good.