I don’t think that plant suffered from low N at any point of its life. You are overwatering thats the cause of your problems imo, do you go by weight of the pot to decide when to water?
Also fuck cfls. You are throwing 200watts of cfl at one plant ime 2-3 14w philips led bulbs could do the job. First of all that plant doesn’t need 200w at this point anyway.
These are 2 pics 12 days apart for the same plants under 240w of led. The 4 plants in the first pic vegged under 5 14w philips leds, monstercropped, topped multiple times and its their 4th day under 240w leds so almost all this lush bushy growth happened under philips led bulbs. They would be bigger i believe if i had let them but due to lack of space i kept them rootbound on purpose.
Disregard the minor deficiencies, i was away for 10 days, now they are fine.
They are under 480 for flowering now.