[AutotelicBrown]

Considering you don't seem to have the foundation for consistent PA, I'd recommend focusing on the highest range you can get SDGs or even AAAs in a couple tries until you can confidently AAA sections that already feel easy to play. It's also a good opportunity to optimize your settings (e.g. offset). Once you get the hang of it, FCs will tend to have lower good counts naturally and will positively impact your FFR rank.

Alternatively, do whatever is funner if improvement isn't your main goal. In the end of the day, actually playing is more important than whatever methods you use.