Last straw...a Frog lives in there!

[BigDave]

Big Toe - shoot, I've seen frogs bigger than my feet. And I'm not even from Texas.
Maybe the G-men will help you carry all that bleach, or at least catch the frog.

Seriously, it sounds to me like you're on the right track, you've got your FC to shock for your CYA (BTW how are you measuring CYA?) and you're keeping it there.

Are you running the pump / filter 24x7? Backwashing when filter pressure rises 8-10psi?
How does the water look, smell?
Are you brushing the pool after adding chlorine?

A couple suggestions:
Your pH reads purple 'cause your FC is so high. Don't test pH until the FC comes down.
No need to test CYA every day, once a week is plenty.
Add more chlorine before FC gets to 25ppm.