So what's the point of Cl? None pro. But that shit accumulates in hemp flowers and combusted said molecule has a tendency to form dangerous carcinogens. You don't want that shit in your buds but Cannabis efficiently assimilates it even up to the point of plant death.
And what's the point of supplementing Ca towards end of flower/before cut? Is the plant happily making new cells still, like a month before? I think not. Even physiologically, if cytosolic N-levels sink the plant's need for Ca sinks likewise. It will just form cytholithic crystals towards the end of the xylemic pathway.
Both is unnecessary/unneeded. Just drop the calnit, save money, gain efficiency.
So who's to say, or rather "proof", the plants' need stays the same throughout the grow. If it were reduced (throttled metabolism) then a fixed EC feeding would mean a relative overfeeding.