1st Grow

This week growth seems to have stalled and there are signs of either nute burn or overwatering. The coco does not dry quickly, it is still very wet after 3 days so I've been doing small feedings but the eagle claw is still in the new growth which is very slow. I am going to not water until the top of the coco is completely dry which will be 5-7 days but am worried about starving them for nutes. Everything I read said it is almost impossible to overwater in coco but it doesn't seem to be the case. Plants are in 12 litre fabric pots so drainage isn't an issue. Side branching is happening but very slowly, not sure if upward growth stalls when side branching appears but am guessing it shouldn't. Week 5 will determine whether this grow will go well or if it is a bust I suspect. I am certain this has nothing to do with genetics but everything to do with my inexperience. Room temperature is under control and steady at 75, Humidity is where it should be but the coco isn't drying out very quickly. I added some powdered egg shells sprinkling it on the top of the coco lightly and watered it in with half a teaspoon of Epsom salts because I keep reading that coco should be charged with calcium and magnesium prior to use and I didn't know that. Perhaps that is why all plants have shown slow growth. Am now running a 600w LED as well as the CFL's all lights are far enough away not to burn. Apart from ceasing to water for up to a week and keeping the nute strength way below the canna feeding schedule I don't know what else I can do. The environment temp humidity is ok so all I can do is to stop feeding, dry out the coco and see if that makes a difference. They can't be far away from flowering now, they say growth will double or triple during that time so I hope these problems are resolved before flowering starts.