Not too familiar with coco, but I am just completing my second consecutive TD grow, so I'll help where I can. I definitely wouldn't defoliate her. The edges of the leaves looked turned up a bit. Kinda like heat stress. What temps are you running? Are you monitoring the soil pH? Both of my TDs' have been nicely coated with crystals, so I'm not sure why yours are lacking. The mote details, the better we can help