Here's my view:
I would agree with the direction you are coming from Pacatus and "happiness" is the term I prefer to use for the reasonable human goal.
I'd also say it appears that just as today, Epicurus' time was filled with religious speculation and terminology. Most people were familiar with looking to the life of "the gods" as an example of the best life possible. Epicurus wouldn't have believed that the gods "bless" anyone directly, but as a shorthand for the best life, which is presumed to be what the gods live, the term probably can be used without injecting too much supernaturalism.
Same problem with "eudaimonia," and it's good demon, but Epicurus used the term anyway. if you want to be understood at all sometimes you have to adapt the common vocabulary.