Not on team but I`m pretty sure lighter sailors can use bigger sails on any given board.I think its because there`s more buoyancy left to to support rig. Other end of scale is opposite.(ie big sailor will get away with a smaller sail on given board.)
So heavier rider wont have a wider range just a different one.
ie I (at 100k) use Evo 92 right down to 4 metre(and below a few times) quite easily but I struggle with 6 and over,whereas daughter (at 65k uses) 6.4 on it (with 30 fin )
At your weight the quoted guides will be accurate.