There's another theory, for those that do body-building / weightlifting, stating you should eat 1gr of Protein per Pound of weight. Some people even do 1.5gr. With that in mind you'd be eating 185gr a day of protein, slightly more than the calculations gave you, and then balance the carbs and fat accordingly.
As Matt has said, this form of eating is far more efficient than the simple "I need so many calories a day" theory, simply because the reactions the body has according to the balance of food is totally different than if it weren't balanced. Is it the same to eat 1000 calories of chicken breast than it is to eat 1000 calories of assorted sweets? Do you think your body would react the same to both foods? This is something I've seen few people emphasize on, and especially those that come from a weights / athletic background seem to not understand.
Also, for energy levels not to decrease, up your fat intake 2X or even 3X.
It takes a week or two to be fully in the Zone for the first time, but after that you can miss a zone meal and the next meal you'll be back in if you balance things out again.
Good luck and if you need some more help you know where to find us