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Yes including copy would be beneficial. Plus Title and H1 obviously. You could write an additional blog post about it and internally link to it with decent anchor text. A social media drive would also help an infographic to rank. If you can post it in relevant facbook groups and google groups and get it to be shared by interested parties on twitter and facebook (include some good text) then this will also help it to rank.

Hi! Are you using clientside or serverside redirects? Since you talk about 301, I assume you use serverside redirects. I think if the rewrite rule is setup correct, then it should preserve the referrer info. But if this is added as e.g. utm_source parameters to the URL, then perhaps you can experiment with the flags set for the redirect rule? Assuming you are working with an Apache server: Looking at https://httpd.apache.org/docs/current/rewrite/flags.html#flag_qsa, it looks as if parameters can be kept/appended to the target URL. Else, the setting [L,R=301] should probably work OK with regards to keeping the referrer. Hope this helps Best regards, Anders