CYA Levels

[hooeld]

Water test this am by pool store:

TC 5 ( I think that is as high as they can read)
FC 5
CC 0
PH 7.6
Alk 120
cal 150
CYA 60

they called for 23.9 lbs Cal hardness increaser..

I plan to drain about 30% of the pool tonight, and try to get the CYA to 40, then address the rest.. I wan the CYA toward the low end, as I have a few Tab's I want to use up, slowly over time, so I want it to be able to raise a bit..

Am I on the right track??