looking good man, I see the dark green you talking about, you made the right move by backing off with nutes when you did.
what bloom nutes you giving and what dose?
continuing with those same nutes and dose would've caused you leaf-tip burn and downward clawing fan leaves. the tips burning is the first sign of root stress because of excessive N, but is also easily fixed by just backing off with nutes for a bit.
I wouldn't say that plant is ready for harvest, at least 3 more weeks and I would only advise to move over to clean water a week before harvest. untill then the plant still needs nutrients. so if a couple days go by and your plant starts looking healthy green again give a 50% dose of the same bloom nutes untill a week before harvest.
as a cannabis plant progresses towards the end of its bloom cycle it starts using less and less nutrients, so always a good rule of thumb to follow nutrient schedules, but towards the end start slowly reducing the amount instead of ending everything off with the very highest or strongest dose like most feeding schedules would advise. their advise to waste is a marketing tactic to get you back in the shop to buy more nutes, sooner.
I do this to save nutrients, because I don't see the need in feeding when the plant can't do anything with the nutes anyway, however you will hear 1000 different opinions on this topic.