It seems to me that you are over feeding as well.
The pic's are telling me... your burning the leaves.
With too much nitrogen.
If your soil has it in it. You are over dosing your plant by feeding it Nutes too.Double doses.
Thats why your plant is growing slow. And that why your leaves are curling and turning yellow.
Garden Knowm is one of the smartest growers here.
Listen to him.
Almost everyone over feeds or over waters at first.
MJ doesn't need so much food. Too much stunts the growth.