Kein richtiges Bud Development

That's called a cola mate. "Buds form together to make cola" that's all I can see. That and a few missed feeds. Also, drop your grow to match a 1-3 ratio. Top max can be in middle. Or even better feed that separately. So, she gets 2 feeds a week. And if needed. You can use your calmag as needed. I don't see a need for it in those pics, "but that's probably y lol", Your bud looks A okay to my. Leafs are a bit droppy. And overall she looks healthy. You had lissues with N i see that. But, now she's left pre flower she'll seek more bloom. And N "Grow" should be lowered.. so 1-3 1 part grow to 3 parts bloom.. .3grow-.9 bloom (these are just examples) of course you'll find your own ml/l depending on your ppm. You shouldn't have to exceed 5-700ppm with any feed. (Tap water included)