Your volume estimate seems reasonable. Your pH and alkalinity levels are fine for now.

So . . . go ahead and add 2 gallons of chlorine each evening. Test using the DPD tabs @ 1:4 dilution (multiply x5) every other day. Skip dosing at 20 ppm FC; resume @ 15 ppm.

Brush the pool completely.

Report FC & CC results once you get the K-1515