Test results, day 2. I added 4 cups of acid last night.
62F water temp
FC-4.6
CC-0
pH-7.7
TA-140 (probably tester error, but I'm learning )
CH-270 (see above)
CYA- ~65 (see above)
Salt- ~3200

Question: Is it necessary to test hardness frequently? I don't think it changes very rapidly, does it?
Anyway, I'll add three more cups of acid in a few minutes and test later today. That will bring me close to Chem Geek's 7.6 cup estimate and we'll see where it goes.
Hal