Thanks, first of all, for the diary... the only thing missing here is the pH ... and since I'm not really familiar with your nutes and since there's no information I can find on them that gives me the NPK of the various components, I have to assume (looking at your dosages) that at least you do NOT have a nitrogen lockout... you seem to be feeding them fairly normally and well.
The only thing I can tell you, at this point, is that it really does look like she's wanting more PK ... this is starting to look like a classic phosphorus deficiency - and I know all the other plants in the box are doing ok but the thing is that each plant is an individual... it's not unusual for them to tolerate things differently and need different things even if they're the same strain from the same seed bank purchased at the same time... For THIS lady, I would be giving her more PK....
Good luck!