Where should TA level be?

I have a newly replastered pool about 6 weeks old (dark grey colorscapes).
These are my current readings. (20,000 gal pool)
FC =3
PH = 7.8
TA = 80
CYA = 60
CH = 360
I am using the BBB method after startup pool guy completed his 1 month service (required from plaster co. for warranty).
I am constantly having to add muriatic acid on a daily basis to lower PH within range but TA tends to drop to 70.

Should i be more concern with TA being it stays on the lower end of acceptable range?

Should i add baking soda to bring TA to middle of acceptable range (100)?

What is best way to add baking soda to pool?
 
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