Hi I have been sailing for a few months but I am still not planning.Im a shade under 100kgs and am using a 150lt board with a 5.8m sail.I realise this sail is small for my size but was useful when learning the basics.I feel comfortable with the basics now so I am wondering what sail size should I go to keeping in mind most of the time I sail out in the bay in 10 to 20 knotts of wind.