well, just a few months ago, they had an update so that DQ can be used on the more current devices.
when it comes to damage affixes… some only affect the Skills of the Weapon they are on and others affect the Weapon with the same Element, and some only affect only one Skill or all Skills.
depending on a Weapons Base Damage and how many stat points you put into Power will determine if WD% or WD+ and if ED% or ED+ is the better one.
Warrior Lance BWD is not the same and corrected in a later post in this thread.
First, Endow MS has been changed to increase a Weapons BWD instead of giving WD%. (I did the math and found out you get more damage this way)
if you look at the formula for DPS, Flat ED+ is calculated last. sure, you can put 7 of them on your Build for +35K ED+, but depending on the Weapon you are using, 1 to 3 +100% ED% with enough Power Stat and maybe Flat Weapon Damage can give you just as much if not way more damage as Flat ED+. Flat ED+ is only good for PVP Builds or a Damage Only Build.
besides, that Swords DPS is based on affixes on the Sword and not the other Items. you’re better off considering the DPS of the Skills on the Stat Page based on all of the affixes on the Build that are considered for DPS.
umm 
the short answer is % Poison is usually better than + Poison, with Legend % Poison being better than Epic % Poison. depending on the Build and Weapon, it might be a toss up between Epic % Poison and + Poison if you don’t have any Items with Legend % Poison.
hope this helps.