But when did he say anything about a low carb diet in the original post? Why are we automatically recommending a low carb plan?
What if the guy described in the original post is very insulin sensitive and doesn't upregulate fat oxidation well? He gets fat!
220g carbs is not a lot for an active individual burning that many calories.
Here is how I believe to set the diet
(1) set calories
(2) set protein
(3) determine adequate carb intake by goals, individual factors (responsiveness, insulin sensitivity, size, activity, etc)
(4) the rest is fat
Percents are not a meaningful way to set up a diet and the body doesn't digest food in percents.
Eventually he will end up in Ketosis if he doesn't consume enough carbs to support activity. Even at 200g a day. The 30g/day figure came out of nowhere and isn't really based upon anything.
Anyway, even for someone maintaining, daily expenditure is going to vary. Trying to eat the same amount is not giving the body what it wants. He should set up a dieting system and eat more food and carbs when he is hungrier, which will follow training and biorhythms and all of that good shit. Some days your sleep, activity, hormones, whatever are going to cause a big difference in what your body wants. In the post workout period, or after several days or longer of a more intense plan, the body may need more food and different kinds of food at random times.
Hence the recommendations to eat extra calories from sugar and protein post-workout, and refeed or cheat day occasionally. Now learn to integrate these into your actual needs and you will do a lot better. Most BB pros don't finish their workout and need the exact same food and measure it out the rest of the day.
In the same way that they "know" how to alter training for the best results. Some creativity and observation is required. It isn't about a system, the stuff you read and learn explains WHY things happen, and can provide general guidelines, but at the end of the day I think it's important to keep in mind your actual goals and the point of what you are doing, otherwise you are just cheating yourself.
I strongly feel that a lot of people taking a really anal approach would benefit from learning to be more flexible and just setting basic guidelines, eating good food when hungry, and seeing how they respond. Learn about your body and then tweak your programs more effectively to your individual needs.