Funny, I absolutely love Flodown and thought it was perfectly placed. Shook things up just enough for me, and in just the right ways, to stay excited through the entire set.
That said I have other albums where there is a single track that feels off-kilter and throws the vibe of the whole album so I fully get where you're coming from. But in this case, for me, it actually bumped the album up a notch rather than down.