

Help with reading order: Darth Vader
I am new to reading Star Wars: Darth Vader; I bought these trade paperbacks, but I am wondering if I am reading the order correctly?
I read volume 1 and 2 by Gillen, Lorraca and Delgado, and then stopped to go buy Vader Down (modern era epic collection), as that was suggested at the end of volume 2 (shadows and secrets).
Admittingly, I bought a different ISBN for Vader Down, because I couldn't find the one suggested in volume 2... But I did look up what the two ISBN's contained, and they seemed to be equal.
But should I be reading certain parts of this epic collection, and then go back to volume 3 (the shu-torun war)?
The first pages of Vader Down seemed to continue nicely from volume 2 (shadows and secrets), but I feel as though I need to read volume 3 (sho-turun war) before i continue in the epic collection at Darth Vader #17 "The shu-toun war part II"?
Quickly scanning through the rest of the epic collection and volume 3 (to avoid spoilers), I did notice overlap with identical pages.. Seems like I didnt have to buy volume 3?? As it is contained in the epic collection?