Need Help! 6 ft. black domino doing poorly in flowering stage!

I have a Black Domino plant 2 weeks into flowering. Leaves are curling badly and becoming brittle. Lower branches are very scrawny, probably due to lack of light, but the top, which had been fluorishing in veg, is now looking bad.I was watering twice daily, 2 qts. each water, 1300ppm. Has been in a 10 qt. bucket for last 2 months, FoxFarm and happy Frog soil mix. I have cut out nutes and cut back watering to clear water, 1 qt. daily for the last 3 days. Figured maybe too much water and too many nutes. Using 1000w hps, and I have to set the plant just off to the side so it isn't too close to the light.The plant has been awesome until flowering, and now it's looking sickly. Temps have been around 80 days and 70 nights, humidity around 50%. No pest problems, good fans, and I have 2 other large plants (bubblegum and romulan) doing great in the same environment. The flowers are emerging on the b'gum and romulan, but not much on the domino. Help!​
 
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