Ive always been the opinion that plants needs to be pushed pretty hard with nutes at a fairly young age, to maximize their potential. Push 'em hard...just not too hard...i would rather be on the edge of toxicity, than the edge of deficiencies with the group as a whole. And then continue to push hard(but not too hard...LOL) with flower nutes to maximize production.
Yeah see I don't do that. I mean I gradually increase but by that time I guess it's too late. I definitely have more rust spot issues with LEDs I haven't really been able to fully conquer. Maybe I just simply need to feed more.

... but I have suspicions about in-pot pH here,... Oh wait, just saw the Temp issues, that explains much! lowers going pale could be P defc., as it's mobile, but uptake sucks when cold, ditto for micros,... Don Skelly
... I blame the cold more than lack of right now at least, so any ramp up I'd do gently,....
oh yeah, N-tox can kick off Ca and K defc.'s,...
... other than the N claw, TF is dandy,... since I ran Biotabs, I can't speak to her N sensitivity, but you may have discovered that for us now,... Skelly's soil is so well digested, can't call from that either,...
But TF is mostly Sativa, AK47 and Power Plant, and they tend to be bitchy about N,...