I haven't been following along, but from what I see here floc can't possibly help. Floc is designed to get particles that are suspended in the water to clump together and fall to the floor. Your water is clear and your "dead algae" is already falling to the floor, so I don't see how floc would help.
I see two possibilities. Either you filter is damaged, and every time you vacuum stuff up it ends up back in the pool, or there is new stuff constantly accumulating. If the filter was damaged I wouldn't expect the water to be that clear. If your CYA is really anywhere near 60, that isn't dead algae. So my guess is your "dead algae" is actually pollen that is constantly falling into the pool. If I am correct, there is nothing to do about it other than to vacuum it up and wait for the pollen season to end.