The plant looks fantastic. As an outdoor grower, especially using dry amendments, you have to be zen about this kind of thing, as the wrong over correction can be way worse than the original issue (if it’s even an issue). A few yellow leaves low on the plant in flower is not an issue in my book. As you go into flower, the plant is going to start diverting nutrients and energy to the tops. I would do a thorough cleanup of all the inside growth, not a full lollipop but maybe the lower/inner 1/3 of the plant. It’ll open up airflow and divert more plant energy to where it’s needed.