I have really only read the Mark Waid Princess Leia comic book series and the DARK EMPIRE comics. In terms of canon, STAR WARS originally took the view that all novels, comics, video games and trading cards were canon, but right from the start, there were serious contradictions. The novels HEIR TO THE EMPIRE, DARK FORCE RISING and THE LAST COMMAND had the New Republic/Rebels successfully establishing a new government after RETURN OF THE JEDI; the DARK EMPIRE comics showed the Rebels' new government collapsing almost right away after RETURN OF THE JEDI. Yet, both were declared canon despite the DARK EMPIRE author confessing he hadn't known anything about the novels.
Some awkward continuity patches were implemented with the initial novels repositioned to just before DARK EMPIRE and the latter novels re-rebuilding the government right after DARK EMPIRE, and constant patching was needed and then THE FORCE AWAKENS threw out all this content anyway in favour of a new Expanded Universe that is supposedly canon but likely has just as many problems.
The main issue is attempting to fit so much material directly into the post-RETURN OF THE JEDI time period -- and this is also common when trying to fit novels, comics, video games, audio dramas and other tie-ins between live action installments of a film or TV series. Unless there is a massive change between installments, tie in stories can't really do *anything* that doesn't put the pieces back where they found them. And, of course, there's the space constraint that tie-ins can either address or ignore.
In the STAR TREK novel, AVENGER, by William Shatner, a character remarks that for all of Captain Kirk's supposed adventures to fit into the original five year mission, it would have had to be a 100 year mission, a hilarious reference to all the novels and comics.
The key would be, I think, to seize on how Luke, Leia and Han are very different in EMPIRE than they were in STAR WARS, and how Luke is very different in RETURN OF THE JEDI than he was in EMPIRE. STAR WARS' Luke didn't have too much depth and seemed certain to always win; EMPIRE's Luke is a far more insecure and fallible character who's clearly had a lot of setbacks and failures; RETURN's Luke is so much more mature than he was in EMPIRE. STAR WARS feels a bit like a children's movie version of space opera whereas EMPIRE is Serious Drama with some jokes.
I think that in comic book publishing, the wish is to keep publishing Luke, Han and Leia's adventures infinitely and indefinitely without worrying about actors aging or dying to keep their characters perpetually at their prime and at the same ages where they originally debuted. Comics themselves are prone to time expansion where there is no sensible way for Spider-Man and Iron Man's adventures to have all taken place without Peter Parker and Tony Stark having been superheroes for 40 - 50 years while only aging 5 - 10 at most. And STAR WARS comics would be no different.