LeeD said..
One of my better wavesailing buds DOES ride a 60cm, 100 liter, 40cm tailed, wave board.
He weighs 235 lbs. and always complains it's too wide to power a bottom turn in 6' waves. Maybe he's a wimp, or maybe YOU have never ridden a head high wave.
Your friend sounds a little unskilled.
I am about that weight and ride a 98L and 115L wavboards.
My 63cm wide 115L (my design) turns bloody awesome.
My 110L Quatro likewise
My 118L Goya did too, but I thought 66cm ish was a bit too wide as it ruins the planing theshold. (PS Hoops me put onto that, intially I disagreed but he was right of course.)
If he is 235lb and can't make a 60cm wide waveboard bottom turn, he's wrong. Great company for you Lee.