The legend break is not specified by either Cohen or RIC: the space between FORTVNAE and FELICI in their descriptions is simply the normal space between words in modern languages, and is not meant to reflect the spacing of the legend on the coin.
So as Chut says your coin is exactly RIC 554, not a variety of RIC 554.
You may add to your classification, of course, that the break FORTVN - AE FELICI seems unusual. But that fact does not affect the RIC attribution of your coin.