What kind of floc do you recommend?
"Slow- rate " is faster than 0.1-0.4 meters/hour. You probably meant to say 1 - 4 meters/hour , and even this speed is very very slow.
Drinking Water Plants run their Filters at about 7 meters/hour.
"High-rate" is up to 20 GPM, which means not 12 meters/hour but 48.80 meters/hour.
I also agree with the OP that Floc is very important to achieve good water clarity.
Also I keep reading that Pools need to be shocked. . . Ask yourself - Isn't that already an admission that something is wrong with filtration ?
If a Pool uses proper coagulation/flocculation it never needs to be shocked.
"Floc - don't shock"