So... the two in question now seem to have good root growth going on. I dialed it back from Sat/Tues to just Sat waterings, but that might not be quite enough. I'm going to try "every six days" and see how that works out.
Meanwhile, being a sucker and deal-maker simultaneously, I chatted up the manager and bought three grocery store Phals for $10 because they were almost out of flowers. Made sure to check the roots first. Roots look good to me (if cramped?). Leaves are all beautiful.
One has some tiny mushrooms because of course they all had water in the plastic pots.
Would you bother re-potting them right now, or when is your expert advice as to what to do with these things?