Did you ever figure out what your problem was? Looks like exactly what I have going on with my 2 plants
I believe it was over fertilizer, had them around 600ppms and i diluted this to 400, they are drinking water faster e.g they take a gallon of water and the nuts are higher 650 if they drinking equally it would have remained as 400ppm but that helped a lot for a few weeks old plant i wouldn't take it above 300 now then add slowly. The pictures won't be the best but it'll show a little progress, take more later Sent from my Nexus 6P using Tapatalk