And do the Ixal beast tribe quests.
Ixali daily quests, GC supply missions, and levequests are the three main sources for quick DoH experience.
You can get Engineering manuals from your GC that boost your XP from crafting by 50% (to a max of an extra 20k or 40k).
Then there are some more minor XP boosts that still add up, like the bonus for making a new item you haven't made before, or the extra 3% XP from food (which would more significantly be being used to boost your CP or Control).