Nute Burn Recovery

I am having trouble with one plant recovering from nute burn. M plants only really need water once a week. I use pro-mix in large enough containers to retain moisture, but I mistakenly was feeding weekly without watering in between. I have other plants on the same feeding schedule that are doing great. I have a G13 Thai Super Skunk that was droopy with all solid green leaves, and needed watering. I fed it with the technaflora bloom mix regular strength measuring 2.1ec. As soon as it drained, I measured it at 4.0ec, and immediately started flushing it with water. I flushed it until the ec read .5, but it continues to get worse. It's been 13 days since that happened. Most of my leaves are curled under with dead spots. I'm 2 weeks into flowering, and the buds are still growing - slowly, but dense and nice. The new growth does not look that great. I've lost about 3-5% of the plants leaves so far, and have not given it any fresh nutrients except for a couple drops of B1 thrive mix somewhere in the many gallons of water I've flushed with. About 6 days ago I rinsed with a rinsing agent. b All of my pH along the way has been fine (5.8-6.4). It looks just like the pic in the "bible" of that haze plant with the leaves curled under. Any help? I really want this plant to live.