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Hey there! There has been substantial research showing that long-form content ranks well. I would continue to review your Google Analytics data to make sure that these posts keep people on the pages and draw high engagement (which will contribute to it ranking well). The hot ranking factors trends lately relate to inner linking and website speed (Google Pagespeed Insights). So in addition to that, I would keep those factors in mind as you decide on how lengthy your content will be in the future. I would set up some A/B experiments to test with the above suggestions in mind.

As our "B" page has no rankings, we will just go with a 301 redirect immediately. Thanks again for you help!

ok, you said link scheme and that text viries slightly, im sorry if I missunderstood your question. Does the pages linked in B or C have a link to A? If that´s the case, then you are in trouble. There is no way to assure that will be no harm, because google keeps the whole history of every site, so they can link internally from that history and somehow punish sites. From my point of view it can be a little suspicious to Google. I´d separate a few weeks from publishing each blog post so it looks less unnatural. And also, remember not using exact match anchor text in every text and/or using the same anchor text. Hope it helps. GR