Got it. Since you don't know what your CYA and FC levels were over that time, it is best to confirm you DON'T have algae before you raise CYA.
If you have to SLAM, higher CYA levels become longer, more difficult and consume more liquid chlorine.
Let's get a real bead on your CYA level. Print out those instruction I linked and follow them.
When you have a chance, do the OCLT. Print those instruction I linked and follow them...doesn't have to be tonight, but some night soon.
Let's do those two before we raise CYA.
On the pH, add enough muriatic acid to lower pH to 7.6 from 8. Retest after 30 minutes with pump running, and report your results. Like to get a feel if your "8.0" is an 8.0 or something a bit higher.