Leaves at top of buds curling downwards

Hey there, bro! 👋 A lot of nitrogen is slowing down the absorption of all the other elements - boron, potassium, calcium, phosphorus. In your photo from 19.06.2020, the nitrogen excess is really noticeable! No worries, bro! You might want to slightly raise the pH to 5.6-5.7 while keeping the same fertilizer dosages you're using now! 👌😇👍 Good luck, bro!