I am considering purchasing a 2010 used Phantom. I see the board weight is listed at 14.22 kg. Does this weight include the centerboard and cartridge? I weighed the board and it came in at 17.73 kg with the straps on, centerboard in - no fin. Is this reasonable or could there be a problem? Are most racers going with a 50cm fin? A 45 cm fin comes with this board – could this be a disadvantage? Thanks for any info.