I am shopping for a 21 ft wac, and have pretty much narrowed it down to a Proline or Mako. Both seem like good quality boats.However, in looking at the specs, i noticed a hull weight for the Proline of 2500#, and for the Mako 3300#. This seems like quite a difference for boats of nearly identical size. Does anyone have any idea on why the mako weighs so much more?