just take the upgrades versions. I.e. if you have two boundless ages power relics (which you should if you're dps) you get two elite war hero boundless ages relics. It is a flat stat increase so no reason not to.
I'll update armory soon to keep up to date with changes.
The problem I am having is with the procs. I just got all my battle master gear a week or so before 1.6 came out (I just started playing) and they are static relics (no proc/trigger). The tooltip on the EWH relics says they do not stack with "similar damage procs" (or something to that effect). Can I use two different procs (internal and elemental, for instance), or do you get the proc off of the first one and the second is completely wasted stats? If they are wasted, I would assume I should go with a healing or defense one just to get some use out of it?