I recalibrated the build table with a thin sheet of plastic (one side of polyethylene ziplock bag). The calibration was easy enough. It appears my build table is about 0.07mm higher off the pdms than before.
Subsequent prints went fine, but it still seems like it's struggling too much to slide off on layer 1 and 2.
I'll keep printing with this calibration. The next calibration, I'll use thicker sandwich bags for the calibrating shim.