I'm not sure what type of answer to give here, except don't be tasteless, and do what looks right. The obvious thing to do, if an idea is spanning multiple paragraphs, is to make it a separate proposition and cite it from within the larger argument. I've found how-to-write-readable-computer-code type guides rather useful in this regard.

The harder problem appears to be when to group separate ideas into a larger paragraph, for which it seems difficult to consistently defend any universal prescriptivist stance. Here's an example (yes, I understand that it is a bit of a low-blow to bring up something you wrote a long time ago): it has often confounded me why the proof of Lemma 7 on page 18 of your honeycomb paper spans three paragraphs. On the other hand, I was really glad that Lemma 8 was broken into various pieces, otherwise it would have taken me much longer to parse.

Maybe the golden rule should apply: would I want to read this in someone else's paper? Personally, I find it much more psychologically satisfying to see "only one more thing remains" at the end of a paragraph rather than at the beginning of the next one.