Amazon will listen to YOU more than me on that last bit. (They don't listen to authors much at all.)
As for rapid release... That, once a month, or more, is about the pattern I've been holding to for years. Don't take my slight annoyance over procedural things with a lack of success. I'm still doing way better than the vast, VAST majority of people on 20BooksTo50K. (Of which I'm a member. They don't have anything going on that I'm not already doing and was before they started.)
If there is a negative influence of rapid release it would be with the readers. I can't track that part, but it's possible that some people don't even look for a new book in a series for a year after the release of the last one. (Still. It's just how a lot of people were trained to think...) That might not be a problem, but it might also be.
*Now, there is a small possible issue in that some of my political content has gotten me downgraded in the Amazon system. I have noticed that certain books, with certain content, were never shown in the system to other people. (It looks very different when I go incognito and check out Amazon than when I do it from my own account!)
That may, or may not, be a thing. If so, it's sketchy as fudge, but it's nearly impossible to prove or disprove, so I'm not going to spend a lot of time worrying about that.
What I can tell you is that books with nothing political in them suddenly spring up to the top, really fast. (Crystals of Memory, for instance, did great.) Also, high fantasy does best for me. That's always been the case. I should focus on that for a while, to be honest, but I've always liked to play in multiple genres. It's more interesting for me.