"24 hours later, a Color-match DPD is registering 2.0ppm FC and 3.0ppm TC. An OTO test was WAY OFF the SCALE yellow. So I think the DPD is being influenced by HIGH chlorine, and in fact I still have chlorine after 24 hours."

If you are describing these results accurately, you were measuring a pool with low FC and high CC. And, yes, high CC seems (sometimes) to show up as FC.

I've never known CYA to be metabolized that rapidly, but then I have no really info on just how fast it can be metabolized. But, it sounds like you've got an algae/bacterial soup that's eating your stabilizer (and turning it into ammonia) as fast as you can add it. My original recommendation (borax to 7.8 & 3 gallons of bleach each and every PM) was almost certainly the right thing for you to do. It certainly would help you resolve your green goo.

It doesn't sound like you've done that consistently.

Messing around with the CYA, TA, & CH now is more of a distraction, than an aid. You need to get the goo (and probably, the ammonia pooped out by the CYA eating bacteria) dealt with first, BEFORE you worry with the other stuff.

If you want to really understand, read Chem_Geek's articles. Otherwise, just do it.

Ben