I also tried adding in the ethereal propertie's additional 50% ED (222 def) AFTER calculating ED% (Like +Max dmg works now) and it still doesn't add up...
(444*2.95)+222=1531.8
Also, just so you know, 444*2.95=1309.8
The ethereal property is obviously not being factored in.
I would've gotten the same result from a non-ethereal Shaftstop.
I'll likely email Blizzard later regarding that, because my item should be close to 2000 DEF.