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

Trace element deficiencies like iron would yellow new growth up top. This damage is not nutritional. It’s from some pest sucking on your leaves.