Are the nutrients that I use ok for the plants ? I...

Well firstly based on what I can see your nutrients that you are using are slightly wrong . When your getting ready to flower you wanna bost the PK of your plants so it helps promote new buds sites as well as facilitate the transition from veg to flower . The reason I say this is based of the pictures I see your plants already showing pre-flowers which means its time to start adjusting for flowering . I might also suggest that you defoliate your plant taking away all the leaves and lower bud sites that wont get enough light to fully develop . This will kick your plant into over drive making the current bud sites you have forming even bigger and form faster . It will also help provide an even canopy so your plant will grow evenly . So all in all I would switch your nutrient line up to a more bloom oriented formula and water them less give them more water at once but don't water them every day this will help your plant go through what people call a dry phase making the roots expand even more because they are looking for moisture . I hope this information helps you ! -Happy Growing!