Good review as always, but that high ripple is strange for a Seasonic unit, even a "low-end" one. Did you maybe consider asking Antec for a replacement/additional unit to see if the ripple issue is maybe related to the particular unit you tested?
Some errata/suggestions (as always

):
Page 2, "Cables & Connectors, Power Distribution": table should say "6
+ 2 pin PCIe"
Page 3, "Exterior": "... only the main ATX cable is stealth", yet it can be clearly seen from the photos that the wires are multiple colors.
Page 3: would be nice if the "psu_top.jpg" had all the cables spread out neatly (i.e. not bunched up and on top of each other) to give an accurate indication of how many cables there are to deal with.