If it isn't obvious, those pucks are the source of two of your problems: Your low pH and your high CYA!
Yup. Pucks are super-acid and drive pH down.
Also, for ever 10ppm of chlorine they release, they add 6ppm of CYA.

Consider a partial drain and refill to get your CYA under control. If it's TRULY 110, then replacing half your water will give you a CYA of 50-60...good for the hottest part of the summer. I like to raise CYA from 30 to 50 sometime in July. But, living in NJ, I don't like going over 50. Our moderator in Louisiana, Janet (aylad) runs CYA at 80 because even though her maintenance level of FC is high, she doesn't have to add it often. Much sunnier and hotter more often down there.

Pool stores don't tell you this stuff then they say "Oh, boy: You have 'Chlorine Lock'!" There is no such thing, just alternate levels of free chlorine to maintain.

Carl