Yellowing/ leaves dying

Good look'n plants dude but I do believe you may have id'd something needs to be rectified. Couple things here but my answer could easily change if I knew what kind of medium you're using (soil or soiless?). If it's not the light combined with the camera flash, the leaves on these plants look a little pale to me which, in combination with excessive yellowing of lower growth would suggest a slight nitrogen deficiency. Additionally, looks like a little rust spotting in one of those photos and that's a textbook calmag deficiency. Your only 1 week removed from the stretch so it's a good bet that these girls were absolutely devouring all the nitrogen and calmag they could find. While your nute mix ratios look good, I'd probably start by supplementing some calmag first and maybe dial back your nitro heavy veg. nute slower than recommended - give her a little extra N at this point than normal just to add some additional stores for the remaining weeks. Good news is that if it is deficient it's really not that bad and likely won't impact overall plant performance through flowering. Best of luck for the flower show dude👍