I've discovered an interesting side-effect of having a demon in a symbiotic relationship:

My energy system is perfect.

From what I can figure, if Adrian is going to get the full effect of the tenth of my energy, my energy system needs to work properly - so it was in his interest to fix it up. Meaning that my recent energy surge isn't a matter of holding more energy, but rather a matter of energy flowing better, thereby making energy actually do more work for its money so to speak.