An update a year later. My slab hasn't moved, heaved, cracked, twisted, tilted, pivoted, or in any way misbehaved, even with 3800 lbs of Dodge Stealth on it.
For a little while, the Wedj-it anchors would lose torque (ie, when I'd check torques, 1 or 2 bolts per column would need about a flat to...