Bleach is sodium hypochlorite and not cal hypo. I have a feeling the Kem-Tek is also sodium hypo as I've never heard of liquid cal-hypo before. Both sodium hypo and cal-hypo neither one have CYA in them.
Keep your chlorine at shock level based on the Best Guess chart. (How did you get your CYA reading of 80?)
If you measured pH while your chlorine was above 5ppm (above 10ppm with the Taylor K2006 kit), you'll get falsely high pH readings. Either test it when the chlorine is low or dilute the sample (half pool water and half distilled water) and then test pH as normal.
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