Ooh, what a great question (and congrats on all your progress)! When I first started writing this story, the chronology was all over the place, with lots of time-skipping and flashbacks, etc., but I've since rearranged it into a more linear structure. I made the change(s) mostly because I felt the skipping was hard to follow and didn't really add much that the reader couldn't gather from the chronological version. The perspective is usually one of the three main MCs, but I do have a couple of supporting characters who get their own POV chapters (all third-person).
As for literary devices, I'm a sucker for an extended metaphor; there's a lot of talk about relationships as games in this particular book, for example. I also reeeeally love using parallels (sometimes subtle, sometimes not so much) to convey the differences between two relationships or the changes in a character over time. ^^ The story is really long, so there are lots of those developments to convey.
Congrats again on getting so much done. Your story sounds really interesting!