Congrats on your loss! One thought that crosses my mind is that maybe fewer, but more intense workouts may help. It looks like you are getting pretty fit and maybe your body has adjusted to your current level of exercise. Curves is a great program to get started. But if you can complete 6 days in a row and not feel tired, you may need to up the intensity with harder workouts.
So why do you break the elliptical into 4 intervals? Can you do 2 a day at 2 miles instead? You might find it harder, but more effective.
Finally burning 3000 cals a day is pretty hard to do. For me, it requires running at least a 1/2 marathon (13 miles) to approach that number, so you may want to revisit your calculations.
Just a thought. In any event, stick with it your fitness level is improving even if you aren't seeing much movement on the scale.
2.5 years, 45 pounds later... 128ish pounds