yea i asked my physics and Chem teachers today. both said that its to do with the charged air particles rubbing against the rubber of te wetsuit that can give the suit a static charge. they mentioned something about the spreader bar attracting the charge also.
and yes nylon does conduct but only when wet or at extremely high voltage.
we are actually doing electricity in physics now and doing alota stuff with static electricity

i tink the board itself could produce a static charge as it has an abs layer. also they spoke about the humidity and moisture in the air making it harder for the suit to build a strong charge therefore it releases the charge more frequently resulting in those lil shocks ya get.
hope my random questioning at school helped