To me this looks like cal/ mag and maybe needs a little nitrogen. I watched a bruce bugsbie video where he stated the importance of Nitrogen. I noticed people are a little afraid of nitrogen making plants leafy but they need it thru growth. They also need some in flower. I noticed my plant use that nitrogen in veg and could use a little more going into flower.
I am doing all no till organic. I noticed with some autos they need cal/mag added 1 or twice. I have been top feeding with a 444 early and then a 4,8,2 and some other ammendements at about week 4 and 6ish.