my plant has just started cresting

my plant's are 3 weeks of flower and they are just cresting/crowning will they start to exspload with more pistals from this point on i'm thinking of giving her food higher in Phos and potash would this help thanks

I want to say in another week or two you should see a difference.

Time for bloom nutrients. Start 1/4 strength.

i have been giving her flower nutrients but i would have thought i would have seen more progressive bud growth buy now thanks any way