In fact, with a size 9 boot should not go over 25 cm WW (depending on the sidecut radius, of course - in case of the Proto both the 25.1cm on the 154 and the 24.4cm on the 152 would work for the guy).
That. And the fact that it will be much more difficult to pressure the edge effectively, compromising edge hold.
im 5'6 185lbs. Would the 152 work for me or should I go with the 154?