That plant should've been wound up like a screw, (what I mean, is it should be so thick you ca not get to stalk) these plant's like very little nutes during the veg. If I ever got over 800 PPM it would just about stall. Durning flower they can not eat enough, they'll eat all the bloom and enhancers you can give her. Not trying to knock you plant but I'd take it and get two or three clones, get them rooted with some light which was your problem, once rooted drop light and bush the hell out of the new ones. Top the plants and let them go until you're ready for flowering. Remember this strain will go a wide as it is tall. Invest in 600 watt HSP, it will pay got it self and get some T5's= 90.00 to 140.00 well worth it. Not trying to slam just sound advice, cause you'll not have enough to pay 1 months electric bill there. Just clone or reveg or better yet start over.