TBH posting something 4+ times just seems silly with federation, we can all see it and it won't make a difference for anyone browsing new. A bit better now that crossposting exists (grouped for me on Kbin), but still. It might depend on subscribers a little bit but more likely you're just splitting the discussion up as there is no merging solution there yet (same for needing to sub to multiple communities to get all the content, but then probably having mess because of it).
I know there is no perfect way to do this, but posting to the the community that makes the most sense and then later crossposting to other communities (and potentially other instances) to get at-very-least different time exposure might make more sense, even better if it's actually new related content (and you link to the previous post).