Your CH isn't all that high, if your fill water is lower then you can let it come down over time.
Here is the process for Lowering Total Alkalinity
Early Sunday Morning. Have only added 4 oz of Cal-Hypo a bit earlier on Saturday.
Sunday Morning:
FC = 7.0
CC = 0
PH = 7.6
TA < 140
CH = 420
CYA = 30
Acid Demand Test says 8 oz. I don't understand how I can have acid demand after a heavy rainfall, but, oh, well.
I will probably wait until about noon and re-test the water.