The short story – yesterday the fish got fed a few times.  I’ve realized that most food blows by the female, so I’m now in the position of having to turn off the filtration so she eats.  This has the positive side that if I leave the water pump off for a bit, I could come back later and siphon off uneaten food (only the male is willing to eat food off the bottom glass).
Last night, they got another 5 gallon water change.  Today, I started off by feeding a couple times, and now at lunch, another 5 gallon water change with Fish Protector in the makup, and then the dose of Maracyn.  Also hitting the tank with the daily dose of Kent’s Vitamin C product.
The sad news is that the female, while she continues to eat, has another clear cut case of Cryptocaryon (ICH).  Nothing “serious” (as indicated by the fact that she’s still eating) but seriously, with almost 2 weeks of Hyposalinity and solid Formalin treatments, I should not be continuing to deal with ICH.  This may be a case where I have to “keep an eye on it”, maybe go for FW dips, or maybe wait it out for another week and then bring up the salinity and hit the tank with Cupramine.  In the meantime, so long as the fish continues to eat, things should go OK.  I’ve been soaking all their food with Seachem’s Garlic Guard, which is thought may help keep parasites out of the gills (key word there is THOUGHT, not “proven”).