WSD doesn't have to do with your height per se, it has to do with your torso and arm length as a proportion of your height. For women that tends to be shorter than for men. Some women can ride men's bikes quite comfortably, others can't.
What's the top tube length of the bikes you're thinking about? Is 54 cm the sloping top tube length or the effective (horizontal) top tube length, and how does that compare to the bikes you're looking at? Can you test ride the bike you're thinking about? What's the frame size of the bike you're on - is it possible it's too big all around? How long is the stem you have on now, and what's the rise - are you at the point where the bike will be too twitchy if you go any shorter?
No answers, just things to think about... it's hard enough to get a fit exactly right in the shop, it can't be done on the Internet...
Speed comes from what you put behind you. - Judi Ketteler