Excess Potassium causing Iron/zinc lockout? did this occur after feeding?
maybe also
Deficient Phosphorous?
PH really shouldn’t matter in soil as soil/microbes are a PH buffer
for example my toms grew in coco last year, had PH issues and needed to adjust every week, they are in soil this year and have not even checked PH once and they are healthy
I would flush Heavily with a 10% feed solution (at least three times the pot volume but more is better)