Not a calcium or magnesium deficiency. They are two different elements that show completely different symptoms. This is pH related. Brown splotching like this with twisted leaves means the pH buffer of the media quickly swung out of range.

Winter Frost has ethylene precursors that you only use for 1 week, starting about 3 weeks from harvest. Do not use it sooner as it will start the ripening phase that prevents chlorophyll production and other important processes. It can be mixed in a reservoir with your normal feed. It’s most beneficial use case is for long flowering plants…

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Don’t think you realize how time consuming and unnecessary the process is. I’ve done grafting with many trees like avocados. There is a very good reason no one does this with cannabis. It’s a good idea on paper, but that’s it. This is a fairly common question new cannabis growers have when they first hear about grafting. As far as plant counts…

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Mold resistance has more to do with bud structure, not root structure.

Looks like leaf miner damage. https://en.wikipedia.org/wiki/Leaf_miner