Thank you for the cookie!
I have to admit, though, that I relied quite heavily on the work of malawiglenn to put those builds together, who is, hands down, this forums most amazing beginner build archmage. So be sure to give him your thanks, as well! 
But yeah, I guess figuring out how to adapt his research to this Sigil Conjurer took some time, too 
You’re right, both flat chaos dmg & attack speed are 100% useless on this build. However, it also gives a tiny bit of %vitaltiy damage; and we really don’t have many other places to put these points into. Maxing out the shaman mastery bar for the life/OA/DA or the Mogdrogen’s Pact base skill for more energy regen is probably just as good, though (and if you ever notice that energy potions aren’t enough to keep you fluild, the latter is defnitely the best place to put them).
On the topic of survivability: The greatest defensive tool of these SoC builds is actually its life leech (and this is usually enough to make you pretty much unkillable already, if done right). Thus, in this regard, the vitality damage synergies with shaman are much better than inquisitor, since damage = survivability here
Just make sure to get Devouring Swarm as early as possible (be sure to apply it generously). The -%vit resist equals a lot of SoC damage – and, with this, survivability through life leech, too. Getting Curse of Frailty/Vulnerability soon after is pretty great for the same reasons; just as Rattosh constellation in your devotion tree.
Edit: Since you mentioned Conjurer being seen as mainly a pet class: I played this very char as both a Grasping Vines Caster & and as a melee lightning slinger (build 1 & build 2) before it became a SoC leechtank; I can definitely recommend you to check them out if you were ever to want some variation in playstyle!
I am, in fact, a guy btw.; though I am very grateful to you that you didn’t assume anything – despite the fact that men still seem to be in a great majority around these parts of the internet 