Sodium hydrogen carbonate is an alternate name for sodium bicarbonate... In other words, it IS baking soda.
You need to lower you pH, seriously. Use Muriatic Acid to lower it into the mid 7s. Do not worry about t/a for now.
You need to lower pH, raise Fc and CYA. You need to add bleach and Stabilizer as well.
Th pool store numbers aren't much different than yours. Suggestion: use you FAS-DPD test with 10 ml of water, not 25 ml. It will save you enormous amounts of the reagent.
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