Fair enough.

Consider this: Your episode 1 can still have a rich backstory without it having come from previous episodes.

As is, I'd have to say that your trilogy isn't coming across as a single narrative. Think of your trilogy as three super acts in a single story. In the original trilogy, the super acts are about Luke, Vader, and the Rebellion overthrowing the Empire. New characters come and old characters go, but the central narrative is the same.

Maybe I'm still not getting you... but your trilogy seems to be "a series of events that all take place prior to ANH" more than a specific narrative.