I'd let the pucks dissolve then switch to unsabilized chlorine, Bleach or Cal-Hypo. CYA of 60 should be plenty.
Did you get a pH today? High FC can artificially raise pH reading but I'm concerned that the last report pH was 6.8.
You are on the right track to clean the pool.
Keep the FC above 20
Run the filter 24/7, backwashing as necessary (when pressure goes up 6-10 psi)
Test and adjust FC at least twice a day
Brush the walls and floor daily
Continue this regimen until one day after all these conditions are met:
The pool is clear.
It loses less than 1 ppm FC from sunset to sunrise.
There is 0 or nearly 0 CC (less than one drop)

The BBB method of clearing a swamp: Bleach Bleach Bleach, Brush Brush Brush

Sorry, Charlie_R and I were posting at the same time - similar advice though.