Got a nice response from Boardworks re: the PSI
The recommended pressure is 14-18 psi. it all comes down to how and where your using the board. Use in a rapid or extreme water conditions I would go with a lower psi, 14 to 16 psi. think of it as a suspension in a car. The more flex, the easier it will be to maneuverer through a rougher condition. Use in a flat water condition; lake, inlet or soft river area, I would use a stiffer psi rating 16-18 psi. this will allow for better glide and speed. A stiffer board will have a better stride with little resistance in the water.
The recommended pressure is 14-18 psi. it all comes down to how and where your using the board. Use in a rapid or extreme water conditions I would go with a lower psi, 14 to 16 psi. think of it as a suspension in a car. The more flex, the easier it will be to maneuverer through a rougher condition. Use in a flat water condition; lake, inlet or soft river area, I would use a stiffer psi rating 16-18 psi. this will allow for better glide and speed. A stiffer board will have a better stride with little resistance in the water.