Any other suggestions?
had a different pool store check my water since it was free and I was in the area.

Stay. Out. The. Pool. Store.
Mixing and matching advice does not work. Twice a day testing isn’t doing you any favors either. The process will still work if you don’t devote the time or attention to it, but it takes much longer.
I would plan on using your next day off to babysit and test/add every 2 hours. Ideally it would be a Saturday/Sunday thing. Saturday every 2 hours, Sunday would stretch 4-6 hours and by Monday your FC would hold long enough to go to work / resume your schedule.