You need to start brushing and vaccuming NOW--as well as raising your chlorine to about 12-15 and keeping it there until the green goes away, which means testing and adding enough to get back up to the shock level at least 2 x daily. Right now your pH isn't as much of a concern as your algae problem, so I'd leave the acid alone--the amount of bleach you're going to use up to kill your algae bloom will probably raise your pH a tiny bit to get you back up to the middle of the " normal" range.

Your FC + CC will ALWAYS = TC, so your strip numbers aren't quite right. You'll do better to use Carl's shotglass dilution method that Marie described above along with your drop-based test kit. Keep your filter running, backwash as necessary, and it shouldn't take more than a few days to get your pool back to blue.
Janet