Here's an update:

Everything LOOKS to be getting back to normal. I was concerned about making too much of a salinity change because much of what did fine during the "trip" to low salinity, was stressing when I brought the salinity up: softies, hammer, bubble coral, anemones. So that's why I slowed it down. Here's where things are now:

SALINITY!: 1.022
Ca: 460 (wow!)
PO3/4: Undetectable (bought a brand new kit from Richard yesterday - old one was Amer. Pharm)
NO3: 2.0
Mg: 1350
pH: 8.1-8.2
Alk: 3.9/10.8 Salifert, 5.5 on the Seachem.

Both Alk testkits are pretty new. The Seachem, I had tested the calibration standard a month ago, and found it to be in error. I emailed Seachem, they admitted they had had a problem, and sent me some new reagent about 2 weeks ago. I tested the calibration standard (4.0) and came up with 5.5. Uh oh. So, I'm PRETTY SURE my Alk is around 4.

Some of the SPS that I thought was toast, is recovering! I'd always thought that once they start bleaching, they are done. But I have several with some bleach spots on them, recovering. And of course, the "ultra rare" super mocha from Richard that I put in the tank on day 8 survived!