Thanks very much for the thoughtful comment. I did originally have 5 a week in as a target, but it didn't feel substantial enough. But I know you're right in that my most popular 'hits' (no conversion at all, but widely read) were the most in-depth pieces.
I'm not convinced that a multimedia shower will convert better than the equivalent articles, I have no data on that at all. I presume you've seen some indicators pointing to mixed media working effectively so I'll take your word for it and definitely incorporate it where possible/relevant.
Hopefully I'll have some interesting data of my own to report at the end of the challenge. Or sooner if it works better than expected. If you've any cases in mind of others doing similar things, with their results, I'd be all ears.