stinging eyes

Hi All, I have a 30 K gallon gunnite pool with SWG. We have had great luck with zero eye issues all summer since opening it for the first time. Chemistry as of last night when people compiling about eyes Ph 7.51 per ph probe, 7.4 colorimetric FC 3.0 TC 3.2 CH 206 CYA 40 TA 76 Borate ~50 I...