Only one of these was started in mg. the other two were started in coco. Surely the one has out grown the mg. since all three have same issue it doesn't seem mg is the problem. I did however find the mg to stunt their growth considerably. Even the ice plant that was started in mg has got past it.
I have two blue dreams going and one seems to be suffering from over feeding. I am blooming in LED so I have to use less already but this girls phenotype is fickle.
Soon when your girls grow past this stage they will start to use that 707 I would not feed them anything while using that soil ... maybe not even till ending nutes