Very nice plants you have there Potchimp.
4 or 5 days, don't they need at least 2 weeks still? Difficult to see indeed.
For my taste experience it helps a lot stopping nutes 2 or even better 3 weeks before harvesting.
But also from experience i noticed especially nitrogen giving sharpness to taste. So it's not a bad idea i think to stop adding N at least 3 weaks before harvest or even earlier. I had good harvest with just thick stems and only buds on them, hardly any leaves or even green leaves.
When keep adding nutes, the plant will use them, so they will indeed produce slightly more, but when plant is mature, it also has a lot of buffer sugars in leaves so that will also still give you budding plants.
The best taste for me was 2 to 3 weeks no fertilizers, only water, for whitish ash, no sharpness whatsoever and deep and full flavor and long lasting high.
Be careful with harversting them to late, because no matter if you keep adding nutrients, like P and K, they still will use sugars and resin beside soil nutrients to transform that energy into buds with less resin and more fiber, that's a growers choise, they high will diminish a bit.
Oh and the cal/mag, the magnesium part helps uptake of phosphorous, but calcium binds phosphorous. It should be advised, to only once a week (wk 3,4,5) to add the calcium/magnesium fertilizer and at that same time not adding any extra P, because chemically it will form calcium phosphate in the water/soil, so that phosphate as far as i know is not suited for uptake, unless they need the calcium also.
And worse case, i experienced, P shortages but the rest of nutes was excessively present. So not that much resin, less buds, and so on.