SE designs weapons for 2 player bases.
Poetics Weapons: Designed for progression raiders in FCoB. These are released to non raiders EVENTUALLY. They have to be careful about how quickly they release them so that raiders dont feel like their work is undervalued.
Raid Weapons (Dreadwyrm): These are for raiders ONLY. They require a huge amount of work and most players just don't ever get them.
Zodiac Weapons: These are designed for the casual player in mind. Players who are not participating in FCoB generally have more time to spend towards farming these items (and GOD do they take forever to farm) but that is their purpose.

Your free ilvl130 weapon from WoD is coming, just hold your horses. If you want an ilvl115+ weapon before then then you need to do T11 or suck it up and get your zodiac. Otherwise waiting is your only option.

Regardless of all of this, holding threat as a tank with an i115 weapon (Shiva since it is very easy to get now) is very possible regardless of what weapons your party is using. Ask my raid tanks. They have done it versus our ilvl130 poetics weapons without an issue.