My alkalinity was 150 when tested at the pool store today.

FC 3.0
TC 2.9
pH 7.8
TA 150
CH 150
CYA 80
20,000 Gal IG Vinyl
Water is crystal clear


Added 1 gal muriatic acid, pH now ~7.0-7.2
To get pH to 7.6 how much borax should I add?
Presently trying to aerate with 2 jets pointing up.