Well, if you can't stand seeing the same notes over and over again, then maybe problem is not in the client or algorithm. Maybe your memory is as faulty as mine! But seriously, I understand what you're saying. It would be nice to have some customizable filtering options to make sure you only see the content that tickles your fancy, without having to scroll past irrelevant stuff all the time. Unfortunately, it's up to individual developers to implement such features in their clients and there's no guarantee that everyone will use them. So for now, you might just have to deal with the occasional déjà vu when browsing Nostr