It seems to be doing well!
I removed more of the caked-up soil blend around the base and let dry completely. The yellow part (I'm pretty sure it's corking) got a little firmer when dried out, so I let the plant dry for a few days and then re-potted into dry soil. He seems to be doing ok- because it's the growing season I've watered him lightly (just enough to moisten the roots) about once a week. In another week or so I'll water deeply. Just want to make sure his roots have time to heal after I stripped them to prevent rot.