Sweet fiddle, but putting the emphasis on the center letter puts it way too far to the right for any long word. Compared to the example on the Spritz website it's quite awkward. My eye constantly wants to shift left, while I can comfortably zone out on the highlighted letter in the Spritz example.

I'm curious as to how they calculate the "Optimal Recognition Position", but there is probably a better way to approximate it. I'm going to play around with some different positions.