Hello friend,
you still have four weeks flowering bur your flowers dont have enough nutrients to give you more.
They will give you a bit more until the end but for much more they need food. My opinion is you to wait two more weeks and harvest, also start since now preparation of new babies. Next time try all the nutriens on the series together with some extra root and flowering boosters.
When you are on bloom phase stop the Bio-grow completelly.
Best wishes!!