Hmm, I had not really considered such a step worthwhile, but perhaps there is something I am not considering at play.
As far as I am aware, people follow the studio rather than the specific games created. Since I have the title to both games in the devlog title and (in the first survey post, at least) a picture of both characters as the header image, I thought it would be clear it is for both, even though it is in the BFF devlog.
I can see the viewing figures for each devlog and I don't think it is a case of people not reading it because it's on BFF. That said, I will put up another devlog now on TTOW and see if it makes any difference.
Thanks for the suggestion ^_^
EDIT: New post is up. I also used the cutest picture of Charlotte, so if that doesn't get people interested, nothing will. lol