Hmmm. Maybe your calories weren't high enough. I'm guessing here. I'm going only my own personal experience.
However, I do know that Dr. Volek and another guy wrote a book about low carb diets for the endurance athlete. Check it out on Amazon. It's gotten some really good reviews.
BTW, in case you didn't know, Dr. Volek does a lot of low carb experiments and kinda "took over" the low carb world after Dr. Atkins passed away. He used to be a competitive powerlifter I believe, so he is really into how low carb diets work more towards athletes instead of the common layman.