Highest set with good stat is triumphant, 5 proc IS the only one WS buff you'll gain on Order ( and as you need to be nearly 50% armor pen to gain 25% more from blessed blade) .
Mdpv is using the Fortress main hand because the damage proc IS armor dependent while it is corporeal damage in the other case.
Auto attack damage on Witch Hunter is crap.
Sentinel Helmet+ring and 5 Vanquisher is the minus to be able to do something.
When in 5 Triumphant, i Saw some WH take Sentinel hand as it have melee power ( and change ring with Triumphant).