Had some rain just now so I can't test again for a bit ( have to wait until the water is remixed) but I went ahead and backwashed the filter again and skimmed up more ghost leaves.
That some serious chlorine use
Likely around a quart a day for your size pool.
It is definitely best to bring FC up to slam level and keep it there throughout the process. You'll have to test often though and that burns through the r-0871 reagent quickly. Your CYA level is quite manageable now, so you should end up with good results.