At 8weeks they would be alot fuller and more mature if fed properly...feed em...its not too late...give em some gas....when I used FF I used half cap of all 3nutrients to a gallon of water abt every other watering n cut bk on the grow big late flower...I supplemented Epsom salt and dolomite lime by adding it dry to soil when mixed and top dressed occasionally throughout the grow
I still use grow big during veg it's a great veg nute...I've since switched up my flower nutes