I realize this wasn't your point, but your comment makes me lean to the Speedplay Zeroes, as they have an adjustable float. As I redevelop my riding skills and see how my knees feel, I imagine I can limit the float more and more. With the flexiblity to back off if I start experiencing problems.

I think you were talking about correct positioning of the cleat on the shoe, which reminds me of my old fixed cleat days, when the cobbler would nail the cleats into the soles and you had to get them just right before he did.