K-Lite is designed to give the proper levels of both calcium and magnesium, commensurate with the amount of nitrogen supplied.
If the issue is occurring with "a couple of" plants and not everything receiving the same regimen, I'd look for another source.
If they are faster growing hybrids, maybe this is simply a case of not feeding enough. Is your "25PPM" TDS or ppm N? If it's the latter, then feeding 4 times a week should be fine, if it's the former, you're severly underfeeding.
Watering with plain water would exacerbate the issue, not stimulate the plant into taking more nutrition up.
Might the potting media just be too old?
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