Lowryder 2 can be a little bit difficult . Ive grown this a few times with mixed results, These are an auto flowering, feminised strain that shouldnt need the light cycle changed, but ive found this isnt exactly true, When they say it will only take 60- 70 days i would always add a few more weeks onto that. You say that epsom salts is good, that is true as it is basically magnesium sulphate (half a tea spoon to 1 liter water) I wouldnt add any unless the leaves are turning yellow, most fert has trace amounts of magnesium in it. Looking at your pics the plants are to young for a seroius nute dose, this can burn the roots and kill your babies. hope this helps