The Reference Desk/I think I may have slipped up in my Doctor Whoah! coverage...

While doing the pages for the Doctor Whoah! strips, I've been doing so primarily using my copy of Whoah! as a guide. When it comes to documenting what strips appeared in what issue, all I knew when going in was that the first strip was published in DWM 369 and, since the collection does not make any mention of what issue each strip was in, I had to use the first strip as a basis and effectively "guess" what issues had which strip.

But I knew from the beginning that a certain problem was going to arise from doing it this way: I am unable to account for any issues where the strip doesn't feature for whatever reason. And I believe I have finally reached that point...

The most recent strip that I have made a page for parodies the climax of The Eleventh Hour. I currently have the strip documented as being released in DWM 420 (which is reflected in the title), but I realised this does not line up with the issue's release date, which was a whole three days before TEH premiered (and I know the strip would never parody a scene that hasn't been released yet). The only possible explanation is that I have, indeed, become de-synched somewhere.

What do I do? Is anyone able to give me a proper issue-by-issue guide for the strips to work with?