Does every carrier/werewolf only drop 2 fangs? Are there some that drop more fangs? If so where should I be hunting? What is the most effective method to finding them? (besides exploring nonstop)

Yes.

During the full moon, I've seen originators drop 5 fangs. They're still pretty hard to kill, and what Ciuin said about exploring being pretty much the best way of finding them is very true.