Comet-- A lot went into this grow not doing well,... keep in mind different strains will respond differently to light, nute's, env. factors, etc.,... What breeders are the seeds, besides Visions Northern Lights auto? Quality of genetics most certainly plays a role in plant performance... but even the best ones can only do so much if other factors are limiting their potential. Auto's in general are more picky about their nutrients vs. photo's, but again, it's also linked to their photo parent heritage
-- the CFL's, are they horticultural type? What's the distance to tops of plants? that compressed structure happens when they're too close, and too blue in spectrum,... You likely already know, this light set-up is suboptimal and will limit what the plants can do,... for the $ spent on bulbs and power (loss of performance from them as they age; 16x23W=368W draw, enough to power a lighthouse of an LED or COB type LED), there are far better alternatives,... some of the inexpensive LED's do a respectable job from what we see here...
-- I know about the Lucas formula, and some can make it work, others have problems,.. I can say for sure that with a multi-part formulation, the complete overall nutritional profile comes from all of them being used, in whatever ratio the sched' was designed to accommodate,.. each individual part is incomplete nutritionally, and if you eliminate one part, you risk shorting certain nute element(s), usually something in the micronutrient family, but sometimes others,... BTW, epsoms are MgSo4, no Ca in there at all, worse, it's a pure salt; too much in the medium will contribute salt build-up; i don't think you're there, but it's no substitute for real Ca-Mg,... Ca plays many roles in plants and being low on that, even if there aren't actual defc. symptoms, can compromise plant performance especially in bloom,... with that added coco, you need more than usual because coco binds Ca preferentially to itself until sated, keeping it from the plant,...symptom-wise, I see mostly N defc, but overall, look a bit starved,... with the infrequent feeding, that makes sense,.. pots are too large for the plants and light set-up (any fluorescent type has lousy penetrations over distance), making dry-out slow, and that mix has nothing in it otherwise... try fabric pots next time, 2-3 gal,...better breathing, faster drying, so you can feed more often... look into other supplements like humic acids, seaweed, Ca-Mg,.. better yet, skip the Lucas formula which is a specialized method best suited for more advance growers who often are supplementing with other things to help cover the bases...
--- pH management doesn't end with the water and feeds, you must keep an eye on the actual in-pot pH as well,.. [HASHTAG]#1[/HASHTAG] problem I see here is off-pH in the medium! ...this affects everything nutritionally,... best tool for this is a decent pH probe, like the Accurate 8.. those skinny cheapie probes at garden centers are lousy inaccurate....