Echoing Tom's point above, if you claim to know your foot width but are looking at boots between 100-104mm, then you really don't. Not trying to be a dick, but it's just the honest reality of people thinking they know their foot (which is natural since you look at them everyday) but you don't know your foot in a ski boot. Hell, the vast majority of pros have no idea.
Just do yourself a favor and try on what the boot fitter recommends. Geometry and last shape vary from brand to brand and "type" to "type". Going in with an idea already in your head is only going to make things harder for YOU.
Ignoring a boot because it is marketed as an "all mountain boot" rather than a "park boot" will only make your search for the perfect boot that much more difficult.