I don't think you should enhance at all until you get to a fight where you need it. The resources are too rare. Granted, I don't follow my own advice and enhanced Firion right away.
I cleared Aigion. It was easy but took around 3hrs with breaks. I used a strong Emperor friend for damage. With 720ish mag, he was hitting for around 250k. I could get him up to 400k with fire imperil from Ling's LB.