Maybe we need a Survival-less Survival thread.
Anyway, @Boogdish and I have been on a similar wavelength, apparently.
I 5-0ed earlier this week with this deck and 4-1'ed over a dozen times with similar builds over the last three weeks.
I've found the Stonecoils/Ballistas to be better than Memnite here, since they not only can be cast for at least twice the power for the same cost with Bridge in the graveyard, but are easier to scale into formidable threats on their own. I've been shooting down Deathrite Shamans with Ballista and closing out games quickly with Stonecoils when the graveyard plan fails (pro multicolor is huge vs Bug/Dack).
Maindeck Leyline has been very powerful in this metagame. Many decks, even the Xerox variants, rely heavily on the graveyard (e.g., Wrenn, Arcanist). Further, making it harder to remove the Bridges gives you resiliency against removal. I only side them out versus Outcome.
The sideboard still needs some work, but I'm sold on the Leyline of Sanctities. They not only deal with Trap/Crypt, but also Hurkyl's Recall, which lets you pivot harder into a prison deck against Outcomes/Combo. With the Bazaar/Squee engine, you can keep piling on the lockpieces against them.
The Wastelands and Ghost Quarters are primarily there for Shops/Dredge. They're also useful against Xerox variants, since they they help to cast threats when you need to dodge graveyard hate and also keep pressure on their manabase while you're chipping away.
Usually, I have one to two Crucibles in the board for the Shops matchups over some number of Quarters/Revokers, which I think is correct.