As you can see, I did use a chocolate cake- but I got milk chocolate, not devil's food. And instead of a vanilla frosting this is peanut butter frosting.
My verdict: there should be a contrasting flavor in the middle vs on the top. I do love me some chocolate and peanut butter though. So really not that bad, but maybe a creamier center? or a raspberry cream center? Tim came to a similar conclusion.
I think when we go back to flag next week, I will pick up some devil's food cake and try again.