You said MG organic right? Ok that has time release nutes as all MG products do. So, my suggestion is too n ot flush it, this will release mor nutes and make the issue worse. Cut back on the additional nutes. You did not mention what dose you are feeding so I am assuming full dose. cut to at least 1/2 dose and let the plants get fairly dry between waterings to let them breathe. If that is the FF Big bud you are talking about, definately cut it down and 1 once every 4th water with 1/2 dose should be ok. How often do you give the MG nutes? You did not specify but if it is every watering. Cut the dose in half and use it every 2nd watering. Then every other watering the get 1/2 dose of nutes. Don't forget to let them get pretty dry between waterings. Just enough to make them roots work to feed, keeps them strong. Good Luck!