I`m not convinced about recommending 103 litres for a 103 kg sailor; sure it would work and work well in good conditions but it reflects situation with high wind/wave boards for heavy weights...There isnt the choice available for over 100kg people..
A 80kg sailor would have an 80 litre board but only for quite high winds/big waves...He`d have a 90 (ish) wave board for general use.. (mathematically thats akin tro 115 ish for 103kg)
If the 113 was more wave biased I`d recommend it but it aint ????!!!
Is there a 115 litre wave board on market ???