i'm 6'3'' i feel for you. i've looked around a lot and never found a park ski in 190 or close to it. 185 volkls measure out shorter than they really are so they're nothing special...idk all i can tell you is that k2 measures longer than they really are, so 179 k2 is about as long as it gets as far as i know. rumor has it moment is coming out with a longer reno jib next season too.
they're over 90 in the waste, but k2 kung fujas come in 189 which will be plenty long for you. thats the best i can think of haha