It's getting late for me, but..... I added 2.5 bottles bleach at 11:10pm. At 11:35, the FC=12.5!!!!!!!(that's 25 drops.... I may run out of reagent before I finish slamming). I'm going to add another bottle bleach now.
Just for my education, why would drain destroy liner?You may not be able to drain your pool if you wanted to as it might destroy the liner.
I would suggest an ammonia test.
You should keep SLAMing, but you could likely just start targeting 10ppm for FC and then be testing your FC and CC after only 10-15 minutes to see when the CC drops and the FC starts to hold.