you need a way to check your pH first and foremost. you can use a freshwater aquarium test kit or you can find a inexpensive digital pH test pen. pH is integral to nutrient uptake.

your soil looks very thick. did you add any perlite? cannabis roots need to get air. thick, muddy soil is not the best to work with. the addition of the worm castings won't help.
try mixing in 1/3 perlite to 2/3 potting mix.

you can re-pot your ladies in new potting mix, without the addition of the time released nutes or worm castings.

these should be some good places to start.


-shake