Pandemic Girl Scout Cookies

Seeing some signs of deficiency, general yellowing. Specially in Plant A, this plant started flowering a bit earlier than B and C. It stretched a bit more and the inter-nodal distance is longer, also the flower pistils don´t have that newborn plump aspect, they look weak and lacking turgor. I am not sure wether this is a deficiency issue or if I´m seeing signs of nutrient lockout (the aspect of the flowers is what makes me think there are lockout issues at play). I´m going to do a flush of plant A and see how she responds. Plant B & C are looking much better but I am seeing early signs of deficiency, but this might be due to the transition to flowering.