You're theorycrafting in the right place, because I spent 30+ hours on the PTR trying to work on various pull/zDPS/tanky builds.
The initial build (which was nerfed into the ground) looked really promising:
Leapquake was proccing Zodiac, so my CDs for leap and groud stomp were coming back in about 2s so I could rotate for perma-stun on the RG. Tanked my way through a grouped GR50+ without taking much damage.
Zodiac nerfed 3 times in a row. In-Geom turned into insta-salvage. Back to the drawing board.
Your build is similar to one of many I attempted after that, it has some downfalls:
Some things to try: