You essentially just wanna give them a good PK right at the very start of flowering like you are now , then you wanna reduce the amount of PK you give over time till its down to its regular dose . You do this in order to help facilitate the transition from veg to flower . Based on what I'm seeing in your diary tho its time to start using it and you may wanna consider a way of plant foods in order to help those buds fatten up , such products like B52 , Bud Candy , Rezin , Massive Bloom can be found in just about every nutrient line up out there they may not be called those of course B52 and bud candy are from advanced nutrients and Rezin , massive bloom are from green planet there are lots of option out there so be patient do your research and choose one that best suits your goals and needs . Other then that your well on your way to getting some tasty medicine looking like your plants almost done stretching and getting ready to start fattening up ! I hope this information helps on your quest to the finish line ! -Happy Growing!