hey hittman, I've found that the best ferts are organtic. Try Foxfarm.com. Organtics are much more forgiving. MJ goes through big changes leading-in as well as during flowering. Leaf loss is common, too much is a sign of a problem leading to less yeild
throw them into flowering(12/12) and blast them with 2tbl /gallon growbig. make sure your lighting is correct for the size of the room. Dont over do attention. Let them do there thing. Learn from expierence. IT takes time. Enjoy your yield. Start a new batch and apply what you learned.