Thank you very much for your reply!
As I tried all of this already I think the conclusion is, to swap to another paper size, though in Germany it’s really annoying to get something between A4 and A3.
One suggestion: Turning off staff spacing collision would be a nice option, if you could turn it of for a single flow or even a single System Break. In my case it’s only around 6 pages, which need allignment, so I finally will try to move everything manually. (it has got a lot of texts, aligning those wouldn’t be less annoying.
Best regards,
MusiChronos