The "newsletter" issue should be handled differently than the "feed" issue.
Newsletter Diversity
I would recommend each newsletter have every article be on a different topic. Yes, always include the top 2 or 3 topics on Dev but then have the rest of the articles be from more diverse topics. By doing this it will both provide readers of the newsletter with a more diverse and interesting read, but it will also bring to mind that writing about other topics (not the top 3) is not just acceptable but also gives you a better chance of being added to the newsletter.
As for how to fix the "feed" issue... not sure.
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The "newsletter" issue should be handled differently than the "feed" issue.
Newsletter Diversity
I would recommend each newsletter have every article be on a different topic. Yes, always include the top 2 or 3 topics on Dev but then have the rest of the articles be from more diverse topics. By doing this it will both provide readers of the newsletter with a more diverse and interesting read, but it will also bring to mind that writing about other topics (not the top 3) is not just acceptable but also gives you a better chance of being added to the newsletter.
As for how to fix the "feed" issue... not sure.