Quote[/b] (Totentanz @ Jan. 27 2006,9
4)]I agree, you probably don't want to bulk yet. It's best to have a clear goal, cutting or bulking. Though I'm about your height, only about a bit heavier, and I would definitely be cutting on a 2000 calorie a day diet... so, you can probably safely consider what you are doing to be cutting.
It's typical to lose strength and energy during a cut. And 3 sets during the 15s can be really brutal. Given how many calories you are eating and how much work you are doing, I wouldn't be surprised if you were losing strength, not reaching rep quotas, etc.
Are you working out the standard 3 times a week? I'd recommend cutting down to only 1 or 2 sets for all exercises until you finish the 15s. You are probably burning out.
Also, it's only been two weeks or so, so it's too early to tell how close you are to maintenance for calories, but you may want to consider bumping up the calories a bit until you get through the 10s. I'd only go maybe 250 calories higher than you are eating now. That should help you maintain strength at least, so you don't have to worry about missing reps.
What does your routine look like? With only 2000 calories, you should really go with as little work as possible to hit the full body. I'd limit myself to probably 6 different lifts and choose lifts that are as productive as possible, then keep to around 2 sets per movement.
Do you have a specific weight goal? I'd probably try to hit 175-180 somewhere. That should put you just under 10% I believe, I don't have a calculator handy though. Once you hit that weight, it would probably be a good idea to eat around maintenance and coast for a while before you try bulking up again.
Good luck.