Heckler, keep it simpler:
200 grams of protein (800 calories minus about 150 for the protein that gets used for anabolism, enzymes, and things like hair and skin that leave the body).
40 (absolute minimum) to 80 grams of fats.
Fill the remainder with carbs, and aim for a mild surplus of 300 or so calories per day.
Don't forget that your body can only use so much protein for building muscle and flesh, the rest will be broken down for energy (at 4 calories per gram, about the same as carbs).
Insulin isn't about energy, it's about not dying. Seriously.
If your blood sugar levels get too high, you go into a coma, lots of metabolic processes get disrupted, and some cells simply undergo aptosis (cell death) because they can't tolerate such high glucose levels. Insulin triggers fat and muscle cells to pull glucose from the bloodstream, thus lowering blood sugar to a safe level. Insulin *also* serves as a general trigger for muscles, so they absorb not only glucose, but also more amino acids and other nutrients. So it's useful to spike your insulin level because it'll promote even higher uptake of nutrients than exercise alone.