Best to add some and retest the next day so you do not add more than you need.
I would stay on the low end of CH if your fill water has any CH in it.
As you know, I took your advice, and, boy, am I glad I did! Poolmath called for 23 lbs. of Calcium, but after only 16 lbs. I'm at 325, which a little shy of the ideal minimum of 350. Per your suggestion of going to the low end, am I safe to assume I should leave it as is?
Also, my numbers are pretty dang good now:
FC 5
CC .5
CYA 35
CH 325
PH 7.6
TA 100
Before I started raising CYA and CH:
CYA 13
CH 178
PH 8.3
TA 93
Here are the order of steps over 8 days, and effects on TA and PH:
Day 1 - Took PH down to 7.4
Day 3 - Added CYA. Poolmath recommended 6lbs., but I only needed 4. TA went down to 80, PH stayed at 7. 4
Day 7 - Added Calcium. Poolmath recommended 23 lbs., but I only needed 16. TA went up to 100, PH went up to 7.6
At your suggestion to take things slower, I discovered that slow and steady seems to win the race here. That, and the fact that I ended up needing less of what Poolmath recommended for both CYA and CH, instead of adding the recommended 3 cups of acid to bring PH and TA down, I added only 2 cups. I will test TA and PH in 8 hours. If that is not the right thing to do, I'm all ears. Also, what would be the effects if TA were to remain a little high?