I fluctuate around 3-5 pounds between weeks (may be less if you are shorter than me..I am 5'9"). I would focus on your measurements, and only weigh yourself once a month. Also, the more muscle you build, the faster your metabolism will increase. Adding strength training to your cardio should help.
I don't use ignite. I try to eat unprocessed food. About the only processed thing I eat are pretzels and feta cheese (not together of course). My one allowance is chocolate, but only in small amounts as its loaded with Calories. I learned long ago that I can't give it up. I recommend using fitness pal for a month if you want to get a good idea what foods have what nutrients/calories. My advice is don't diet, start making small, healthy alterations: E.g. Drink water instead of juice, Balsamic vinaigrette instead of ranch dressing, carrots and hummous instead of chips. It needs to be a gradual lifestyle change.
I only way myself once a month as I fluctuate naturally between weeks.
When I was in college rowing, I had to increase my food intake to 5000 Calories a day. After I graduated, I stopped exercising as much, so I needed to decrease my calorie intake back to 2000 (ah, the good old days). I was hungry for about 3 months. As soon as your stomach shrinks down to size, it will get much easier! I find that drinking water before meals, eating slowly, and getting 8 hours sleep help (I am hungry at night if I stay up late). Also, the more you walk places, the more you can eat : )