Ok, a 6ppm increase with 12.5% bleach equates to around a 21,000 gallon pool. Pretty good logic you got there. Can you post measurements? I'm sure someone on here can figure it out.

Chlorine loss is more of a percentage function. The higher it is the more you lose. You seem to be at a 30% loss more or less. That ain't bad. I see no harm in bumping CYA up 10ppm. Let's get a solid number for pool volume first.