With a CYA over 100 and who knows how high it actually is, you should not use those trichlor tabs. They have CYA in them and you don't want yours any higher! They also are very acidic and will drive your pH down.

Did you try the dilution method to see if you can get a more accurate CYA reading? Take a look at this chart. It explains the connection between CYA and chlorine. (Copy link and log out, then paste in browser window.) http://pool9.net/cl-cya/

Glad you got your pump issue solved.