Amazing to me that manufacturers still quote this nonesense about sail range with no mention of weight !!
(Mind you when they cant measure the volume of boards properly it shouldn`t be surprising)
Any board asked to carry a load of 100kg will never have same sail range when carrying 60kg.. It simply cant...
A heavier sailor will not be able to carry as big sail on a given board but will be able to use the board with smaller rigs... A 100k sailor can knock roughly (roughly) 1 metre off top and bottom limits of sail range.