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Short skis suck; I'd go 184. That's still fairly short, and it's not a big ski at all so you shouldn't have any trouble driving it unless you are an exceptionally terrible skier. The only reason I see for going shorter is if you like doing 450's onto rails with no lip.
Usually I am always a proponent of longer skis, but there is no need for a 184 at your weight. You will only be adding swing weight in the park and unneeded length and slower turning. Stick with the 178, it will be plenty for your size