Notice there is no agreement on whether you have a deficiency or not. You probably do, and it's probably mixed. But you make a point about yellowing being an indicator of finishing. Doesn't mean the plant yielded its max possible, but does mean it is nearing the end of its life. You wrote; "i pull off the leaves at 50% yellowing. and most were covering buds. so they get moved, yellow get yanked..." Flowers are less photosensitive than leaves, and leaves feed growing flowers. Even a pale leaf is feeding flowers. Let leaves nearly off...when they're dry push them down but do not remove them.
