No.
Fertigating with just cal-mag is a problem that can lock-out other nutrients. Nutrients should always be fed with all of the elements present in a "balance" with each other. When you feed just cal-mag the concentration around the roots gets too high locking out other elements.
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I would just feed your normal base nutrients and bio-stimulants now. It is hard to tell at the end of the plants life what it might need because some of what we see is the plant just finishing.
She will be ready soon and the quality looks good!