I have a venture that measures 21.5' long. I have learned while buying new sails that my jib is the correct size for a Venture 21 and my boom is mounted only about 12" above the deck so I think mine is a 21, however I would like to know if or how much bigger is a 22? I am going to raise my mast 12" more giving me more head room under the boom so I can put on a bimine like I see on the 22's. I am also wanting to put on a biger head sail. Does anyone have any advice?