Surfers overall durability is also dependent with how much pc is left in him..
Take the Enslaver arc as soon as his double run out of energy he was toast and he knew it.. So even if the board and Surfer is made of similar composition, the pc that is within is different, more so in Norrin than the board therefore the body is much more durable than the board.. Ill look for that scan.. It had a little bit of exp.. i think...