Nice filled scrog! A lot of nice floweringtops!! The yellowing is a Lack of Nitrogen, the girls need a lot in this stage( strech before / in flower) ou can up you nitrogen a little until streching stopped. a big helper is always Calcium and Magnesium to keep the photosynthesis going
I would go with single products / Calcium/ Magnesium/ and a growing fertiliser, if the green get s better and the sigle spot appear new, only calcium and magnesium , you can give pretty high dosages to the plant because it dos not harm her!! Single products without Nitrogen you can find from canna
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